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Wine Industry History: Early California Winemaking Relied on Native Americans

Father Junipero Serra (center) was instrumental in establishing the California wine industry.

Almost all California historians will tell you the state’s wine industry was started by Spanish missionaries in the late 18th century because they needed wine for their religious services. Eventually, they would establish 21 missions from San Diego to Sonoma. These Franciscan fathers were led by Father Junipero Serra, who would, amid controversy, be canonized as a saint by the Catholic Church in 2015.

“In 1777, Father Junipero Serra wrote to the viceroy of Mexico and asked that grapevines be sent to California,” said Frances Dinkelspiel, author of Tangled Vines: Greed, Murder, Obsession and an Arsonist in the Vineyards of California. She quoted Father Serra as writing, “The lack of wine for mass is becoming unbearable.”

“Grapes were brought in May 1778 on board the supply ship San Antonio and were unloaded in what would one day be Orange County,” said Dinkelspiel. “They were planted at San Juan Capistrano. The first vintage from those grapes was probably 1782.”

The grapes were called mission grapes, and they flourished in the Orange County area. Even so, the Franciscans decided to concentrate their winemaking efforts at their missions across the state.

The area around the San Gabriel Mission soon produced the most wine in the state with about 170 acres planted and 35,000 gallons of wine a year produced. The next biggest wine producer was San Fernando, followed by Ventura and San Jose, according to Thomas Pinney, author of The City of Vines: A History of Wine in Los Angeles.

Working Conditions
“The Franciscan friars came to California with the intent of converting Native Americans to Christianity,” said Dinkelspiel, adding a lot of Native Americans agreed to be baptized not knowing what they were signing up for.

Crystal Dozier, Ph.D., assistant professor and archaeologist at Wichita State University, said it’s likely Native Americans made wine before the European settlers arrived (photo courtesy C. Dozier.)

The Franciscans insulated the Native Americans and tightly controlled their daily lives. They separated the men and women and “made Natives work in the fields, regulated by a series of bells,” she said, explaining the church bells would signal when it was time to wake up, when it was time to start working in the fields, when it was time to eat and when it was time to sleep.

Many Native Americans became addicted to aguardiente, a type of brandy made from mission grapes that was 18% to 20% alcohol. They were not permitted to drink at the missions, so they would go to Calle de los Negros, a rough street in Los Angeles that was filled with brothels, saloons and gambling parlors, according to Dinkelspiel.

The Gold Rush caused a shortage of workers to plant and harvest grapes.

“When gold was discovered, most young men left for the gold fields, leaving very few people behind to grow food,” Dinkelspiel said. “So, vintners relied on the workforce that was available: Indians.”

The very first law passed by the new state of California in 1850 was intended to keep Native Americans in the vineyards.

“It was nicknamed the ‘Indian Indenture Act,’ and it was adopted to address the worker shortage caused by the Gold Rush,” said Dinkelspiel. “The law allowed any white man to identify a Native American as vagrant, lazy or drunk, which would permit a marshal or sheriff to arrest and fine him. Since most Native Americans could not pay the fines, a week’s worth of their labor would be auctioned off to the highest bidder, who would then pay the fines.”

A piece of pottery from an archaeological dig analyzed for evidence of wine (photo courtesy C. Dozier.)

Many of the businesses paid their workers in wine, she said. Since Native Americans had more difficulty processing alcohol, the sheriff would round them up. Most of them were put to work in the vineyards.

“They thought of them as savages,” she said about the mindset of those running the state. “They’re ‘inferior to us.’ It was indentured servitude.”

Early Native American Winemaking
While almost all wine historians will say California winemaking began with the missionaries’ need for wine, a recent discovery in Texas suggests the possibility Native Americans made wine before the European settlers arrived.

“I think it’s likely because wine is a highly soluble product,” said Crystal Dozier, Ph.D., assistant professor and archaeologist at Wichita State University.

The archaeological digs she conducted at three sites near Austin, Texas found ceramic remnants dating from 1300 to 1650 with the residue of two compounds, tartaric and succinic acids, which are both found in high concentrations in wine.

The area, which was inhabited by those believed to be ancestors of tribes such as the Lipan Apache, is known to have had grapes for many centuries.

“Texas is a great place to grow wild grapes,” said Dozier. “The early colonists were taken aback by how abundant the plants were.”

Historically, tribes in North America are known to have produced a variety of fermented drinks. Balché is a Mayan drink made from the bark of the balché tree and a small amount of honey. Pulque is a light agave wine produced by the Aztecs. Tribes in Southern Arizona and across the border in Northern Sonora produced saguaro cactus wine from the red fruit of the saguaro cactus. In Southern Mexico and Central America, Native Americans made coyol wine, an alcoholic beverage from the sap of coyol palms.

Virtually all tribes in North America had some fermented beverage that was reserved for special occasions when groups of people gathered, such as meetings of tribes for trade or other negotiations. Based on “the large ovens and big crockpot” and the amount of trash discovered during her dig, Dozier estimates “hundreds if not a thousand people” would often be at these events.

After Dozier published her findings, a similar study found what scientists believe is evidence of the earliest known wine drinking in the Americas on ceramic artifacts found on Isla de Mona, a small Caribbean island between the Dominican Republic and Puerto Rico. The findings were published in Archaeological and Anthropological Science: Reports.

“It’s not the only study that found wine,” said Dozier, adding the likeliness of the discovery of a different fruit (causing the tartaric and succinic acids residue) is unlikely. “There are less varieties of fruit produced there.”

It seems it would be easy for tribes in California to make wine from grapes, which were abundant in the state.

“If you put grape juice in a container, it will start fermenting based on temperature,” said Dozier. “All the yeast needed for fermentation can be on the skin of grapes. You start seeing fermentation at 12 hours. Wine should be produced in three days whether it gets a high enough fermentation to be what you consider wine.”

Or Maybe Not
“While there is evidence native Californians harvested and used local wild grapes (Vitis californica), from our understanding, the production of grape wine in California did not take place until the Spanish Mission period,” according to an archivist at the Autry Museum in Los Angeles.

Vitis californica has been abundant in California for centuries, but it is considered too bitter for winemaking. Instead, it has been used for other purposes such as making jelly.
Since Native American tribes often interacted with surrounding tribes, perhaps any winemaking knowledge the tribes in Texas may have had eventually found its way to California.

“I haven’t seen any evidence of California artifacts in the sites in Central Texas, and no California sites have Texas artifacts,” Dozier said.

This suggests California tribes would probably not have learned any possible winemaking techniques from the Native Americans in Texas, but that may never be known. No archaeological digs in the state have made this question a priority, according to Dozier.
“No one has looked for wine residue,” she said. “Also, some areas never produced ceramics.”

Sustainable Story Series Powering the Future of Wine: Climate Smart Sustainable Energy

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Finding ways to improve energy efficiency is key to reducing greenhouse gas emissions and combatting climate change. Even small changes accumulate to make a significant impact.

What does a typical day for you look like? If you’re reading this in the 21st century from the modern, industrialized U.S., nearly all your daily tasks require readily available energy in the form of electricity or fuel.

From industry, to transportation, to powering our homes and businesses, the U.S. produces and uses a considerable amount of energy. While energy comes from several sources, fossil fuels are the primary source for all sectors (U.S. Energy Consumption by Source And Sector 2022).

Atmospheric carbon dioxide levels have been on the rise since the Industrial Revolution and have increased exponentially since the 1960s (Climate Change: Atmospheric Carbon Dioxide 2023). Burning fossil fuels for energy production is responsible for over 75% of global greenhouse gas emissions and nearly 90% of all carbon dioxide emissions (The Production Gap 2019).

Finding ways to improve energy efficiency is key to reducing greenhouse gas emissions and combatting climate change. Even small changes accumulate to make a significant impact.
Climate-smart companies make energy efficiency a key component of their sustainable business model. Sustainable winegrowers and winemakers have several paths to greater energy efficiency.

Do you know how much energy goes into producing your favorite bottle of wine?
Making wine is an energy-intensive process powered by batteries, fuel and electricity. Energy is used at every step of the process, including field equipment that tends to the vines and harvests grapes; de-stemmers and rollers that turn the grapes to must; and the pumps, cooling systems, bottling lines and cold storage that bring the wine to completion.
With so many uses of energy, there are many places where efficiency improvements can be made.

Options in the Vineyard/Winery
In the vineyard, tractors and heavy equipment are the highest energy users. Greater efficiency can be achieved by using equipment that covers multiple rows or uses multiple attachments.

These equipment modifications reduce the number of times tractors need to drive up and down vineyard rows, cutting fuel use and emissions. Plus, this practice reduces compaction, helping to maintain healthy soils.

Using all-terrain vehicles instead of tractors and trucks for light-duty jobs, replacing older, less efficient motors and equipment, and ensuring all these are regularly maintained compound to make significant improvements to a vineyard’s energy efficiency.

Beyond vehicles and equipment, irrigation system improvements also make an impact on energy use. Variable frequency drive motors regulate and modify pump speeds to ensure they are working at an optimal level. Many companies today even offer solar-powered irrigation pumps, so operations that cannot invest in a solar field can still access this renewable resource.

Center of Effort Estate in Arroyo Grande, Calif. decided to make energy efficiency a key component of their sustainable business model (all photos courtesy Center of Effort Estate.)

Since turning grapes into wine requires a lot of equipment and refrigeration, addressing electricity use is key to improving energy efficiency in the winery.

Conducting an energy use assessment is a great place to start. The assessment will reveal when and where energy is being used so informed optimization and conservation efforts can be made.

When the team at Center of Effort Estate in Arroyo Grande, Calif. decided to look at their energy use, they discovered several areas they could adjust to be more efficient. Over time, these changes have compounded tremendous energy savings.

Shifting their winery’s cooling system to run during off-peak hours was a simple yet powerful change. They programmed their chiller to turn off during the times in the day when energy-demand is high. The thermal mass of their tank storage keeps everything cool until peak hours are over and the chillers can kick back on.

They saw the value in investing capital into improving their energy efficiency by replacing their 15-year-old chiller with a newer, more efficient one. This new chiller allows them to bring tank temperatures down on select tanks rather than the entire plant. The upfront financial investment started paying itself off immediately in the form of reduced energy use.

HVAC needs are high in a wine production facility. Center of Effort made two changes to minimize their use: cooling the barrel rooms and case goods storage rooms with nighttime air and installing a quick-draw door to address insulation losses in their production room.
Frequent forklift traffic meant their standard garage door was often left open. While convenient for the forklift operators, this allowed cool air to escape the production room.
Now, every forklift has a garage door opener that operates a quick-draw door. The door opens in two seconds and remains open for only seven seconds, plenty of time to get in the door and not so much time that dramatic temperature changes occur.

Center of Effort’s energy reduction changes have made the facility net-negative, meaning electricity is being sent back to the grid.

“A lot of the changes were pretty simple and had varying impact, but all together compounded into very meaningful differences,” said Kevin Bargetto, associate winemaker.
Even before these smaller energy-efficiency changes were made, Center of Effort made a decision that would eventually turn their energy use to net-negative; they went solar.
Their solar plan went live in 2016 and was built to meet 95% of the energy needs of the winery at that time. It was a higher-than-average energy assessment for their first year being solar that compelled the team to look at how and when they were using energy and make all these improvements.

With the energy efficiency changes made over the past several years, the winery and hospitality areas are now fully powered by the sun. In fact, they are running net-negative, meaning they are even sending generated power back to the grid!

Nathan Carlson, winemaker and general manager, said the solar project “showed 100% return on investment over four years, no problem.”

Renewable energy sources play a significant role in reducing the amount of greenhouse gases released into the atmosphere. Producing energy from wind, sun and natural waterbody movement produces little to no greenhouse gases.

The amount of energy produced from renewable sources has increased over the past several decades. In 2023, the U.S. generated nearly 12 times as much solar power and 2.6 times as much wind power as it did in 2013 (Renewables On The Rise Dashboard 2023).
While he recognizes not every operation can go solar, Carlson suggested there are still plenty of areas where wineries can economize. “Question your process and make sure you are managing correctly,” he said. “Start by looking at energy set-points and asking, ‘Can we get by with less?’”

Businesses with sustainability goals know improving their energy efficiency is one of the easiest and most cost-effective ways to reduce their carbon footprint and increase their bottom-line.

They also know talking about these sustainable initiatives aligns with consumers’ shifting interests.

This alignment is so strong that some customers are even willing to pay more for wines produced sustainably, according to a 2021 study conducted by Kathy Kelley and her colleagues at Pennsylvania State University (Kelley et al. 2021).

“We’re seeing a consumer group that wants to be educated and wants to know exactly what is going on with sustainable wine production,” Kelley said.

It’s important to note the power is in describing specific sustainable practices, what they are and how they make an impact, something we like to call “telling a Sustainable Story.”
In the next Sustainable Story, learn from a Santa Barbara-based vineyard management company how working with an environment’s natural ecosystem can support a cultivated agricultural system.

What’s Old is New: Growers look to wooly weed eaters to help economically and ecologically augment vineyard management

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Some vineyardists, such as in the Lodi area, use sheep shortly after harvest to clean up vegetation in the vine rows (photo by V. Boyd.)

An increasing number of winegrape growers are resurrecting an age-old practice of grazing sheep in vineyards to manage weeds, improve soil health, recycle nutrients and potentially reduce costs.

As with any new system, adding sheep comes with its own set of challenges. But many adopters say most issues are easily addressed and don’t discourage them from the practice.

Tommy Fenster, a UC Davis doctoral student, is trying to quantify how integrating sheep and other regenerative practices affect 45 selected vineyards from Lodi to the North Coast. Half are using livestock, while the other half are using conventional weed control and management.

At the end of his research, Fenster said he hoped to develop best management practices for grazing vineyards, incorporating what he found as well as knowledge from producers in Europe and New Zealand. Included will be an economic analysis related to hiring contract grazers.

Fenster’s project also is part of the much larger Ecdysis Foundation 1000 Farms Initiative, a two-year effort to research regenerative farming systems nationwide.

Working with Nature
Since Paicines Ranch was founded in 1846 near Paicines, Calif., cattle and more recently sheep have grazed the hillsides. Beginning in 2001, ranch managers moved to a more holistic approach that used regenerative practices to try to return the exotic annual grasslands to native grasses.

When ranch owner Sallie Calhoun decided to plant a 25-acre vineyard beginning in 2017, she wanted to take a similar path.

“It’s flipping this whole idea of controlling nature and instead working with nature,” said Kelly Mulville, director of wine growing for Paicines Ranches. One of the operation’s goals is to increase biodiversity while remaining profitable.

Winegrapes are not new to the ranch, with it hosting what was at the time the world’s largest varietal vineyard in the 1960s through the 1990s.

Mulville described their latest vineyard endeavor as more of a large-scale experiment that includes 17 different varietals. They looked globally for varieties that would thrive under similar hot, dry climatic conditions as those found near Paicines.

Frankie Arburua III, owner of F Ewe Sheep Co., conducts contract grazing for vineyard owners in the Lodi, Calif. area. In late fall through winter, the ewes give birth to lambs, which also feed on vegetation (photo courtesy F. Arburua III.)

They planted the first 12.5 acres in 2017, hoping to take what they learned and apply it to the second planting of 12 acres in 2000. Mulville said he also sought a trellis design that would allow sheep to be grazed year-round in harmony with the vines.

Texas viticulturist Jerry Watson had developed a trellis system that improved airflow to reduce mildew under humid Texas conditions. But it also elevated cordons to 66 inches, high enough off the vineyard floor to protect fruit from sheep grazing, Mulville said.
At the same time, the trellis design allows sheep to nibble on low-hanging parts of the canopy and provide shoot tipping and suckering. The drip lines are hung just below the cordons. A V-shaped split at the trellis top creates two fruiting walls, allowing leaves to catch more sunlight while partially shading fruit.

“You’re getting more fruit per vine this way, and the quality is very high,” Mulville said, noting a Grenache yield of 5 tons per acre in their third harvest. “We have a rather long wait list for our fruit.”

Mulville planted the vineyard using 6-by-12-foot spacing, about half the vines of a traditional VSP vineyard. The additional spacing not only reduced planting costs but also made it easier for sheep and hand harvest crews to move between rows.

They chose hair sheep because they are hardier than wool breeds and have a wider pallete when it comes to vegetation. Of the 2,000- to 4,000-sheep flock on the ranch, Mulville said they run a portion in the vineyard for short periods based on the growth rate and recovery of the vegetation. By using sheep, they’ve significantly reduced tractor passes to just nine or 10 per season for fungicide sprays and applying and removing bird netting. The sheep also act as nutrient recyclers, eating vegetation and turning it into manure or urine.

“Sheep or any type of animal are not actually producing nutrients; they’re cycling them so they can only produce what they’re taking in off the ground,” Mulville said. “The really important thing with livestock in general is that they’re taking that material, that N, P and K, and they’re making them more available through fermentation in the stomach.”
The urine, in particular, is a good source of nitrogen and potassium and was one reason why Mulville said they chose to set up the vineyard to allow year-round grazing.

Already, he has seen a 5-point Brix increase in their sap analysis, which is an indication of healthy vines. Mulville also noted soil carbon levels had risen by nearly 2%. That equates to about twice the soil moisture holding capacity as it was before they started. During last year’s record rains, he said they saw no runoff.

In addition, Mulville said they’ve documented more than 60 bird species and more than 100 species of plants, most of which were not introduced to the vineyard. Before they planted, they had only found 11 plant species.

Grazing Benefits Organic, Conventional Alike
Vino Farms began looking at sheep for weed control when it began converting some of its vineyards to organic in 2018, said Daniel Meyers, Vino Farms viticulturist in Lodi, Calif.
“When you go organic, you essentially have very few options for weed control,” he said. “It’s just a great way when you go organic to graze everything.”

Their goal was to replace mowers used to reduce vegetation so drill-seeded cover crops would have an easier time getting established. In the process, Meyers said, they found sheep also were good for late-winter or early spring cleanup.

In vineyards with resident vegetation in the middles, the sheep help lower it to reduce frost risk, eliminating another mower pass.

The system worked so well that Vino Farms expanded sheep grazing to conventional vineyards, particularly those in the Delta where the high water table keeps grasses green year-round.

Grazing conventional vineyards also enhances preemergent herbicide activity by removing excess plant matter and improving soil contact.

Altogether, they’re currently using sheep on about 2,000 acres in the northern San Joaquin Valley and Delta because of its cost-effectiveness, Meyers said.

Vino Farms chose to contact for grazing services with Frankie Arburua III, owner of Lodi-based F Ewe Sheep Co. Based on his experience, Meyers said shepherds in the Lodi area charge between $20 and $60 per acre, depending on the acres growers can commit.
As part of the contract with F Ewe Sheep, someone cares for the animals, moves portable electrical fences and transports them among ranches. What makes the arrangement successful is good communication between the parties, Meyers said.

A vineyard, for example, must have a fair amount of vegetation to make it worthwhile for the herder to bring in animals.

“It has to be pretty messy,” he said. If in doubt, Meyers will take a vineyard photo and send it to Arburua for his opinion.

In early spring when they’re applying fungicides, Meyers keeps Arburua in the loop so he can move animals “and he’s ahead of it.”

“It’s really important to have someone you can trust. It just makes it very easy,” Meyers said.

As older vineyards are removed and replanted, he said they likely will move to a single high-wire trellis system that allows for full mechanization of cultural practices. Having the cordons higher off the ground also lends itself to grazing for a much longer part of the season.

Because Vino Farms doesn’t have the facilities or space to maintain their own sheep, he said they plan to continue contracting for grazing services.

Sheep for Rent
And it’s for just that reason that Arburua, a fourth-generation sheep rancher, said he has seen his contract grazing business grow substantially the past few years. In 2021, he conducted a sheep grazing field with the Lodi Winegrape Commission on the 18-acre Schulenberg Vineyard. The vineyard is certified sustainable under Lodi Rules.

“Ever since then, it’s grown from doing 20 acres,” Arburua said.

This season, Arburua has 700 to 800 ewes, not counting lambs they produce, and estimates he’ll graze about 2,000 acres. Eventually, he’d like to build up to about 1,500 ewes.

His brother, Vince, has a separate contract grazing business, VA Livestock, with about 700 to 800 sheep.

Frankie Arburua uses hair sheep because they’re hardier, less prone to hoof rot, have lower nutritional requirements and don’t require sheering like wool sheep do.

How long the sheep are left in a vineyard depends on location, vegetation and the grower’s goals. Arburua said he also weighs the number of animals with the size of the fenced-off paddocks to minimize potential compaction.

The vineyard grazing season typically ends after budbreak in April. But Arburua is exploring how to extend the season and worked with a Linden-area walnut producer in 2023 to run sheep in orchards after grapes. He said the orchards could be grazed for much of the season were it not for food safety rules, which require animals be removed 120 days before harvest. Grapes destined for wine production don’t fall under those rules because fermentation with accompanying alcohol production is considered a pathogen kill step.

LAMP as a New Tool for Testing Grapevine Red Blotch Virus

Typical results from colorimetric GRBV LAMP reactions. Yellow indicates a GRBV-positive reaction and pink indicates a GRBV-negative reaction (all photos courtesy J. DeShields.)

Since its discovery in 2008, grapevine red blotch disease (GRBD) has negatively impacted the quality of wines due to reductions of sugar and color in the fruit. Its economic impact in the Western U.S. is estimated to range from $2,200 to $68,500 per vineyard depending on the growing region. Due to the presence of an insect vector capable of spreading the grapevine red blotch virus (GRBV), healthy grapevines can often become quickly infected during the growing season and symptoms can go unnoticed until the following season. Therefore, early detection of GRBV is even more crucial to preventing further transmission of the virus.

Symptoms of GRBD are often expressive in their characteristically red blotching patterns on leaves of red wine cultivars and likewise with yellow/yellow-white blotching on the leaves of white wine cultivars. However, symptoms on grapevines with established GRBV infections typically do not appear until after veraison. Consequently, molecular detection of GRBV can be critical for early determination of the infection status during early, non-symptomatic stages of infection.

Available GRBV Testing Strategies
There are multiple methods and strategies for diagnosing GRBD, including foliar symptom observation and monitoring, hyperspectral imaging, conventional polymerase chain reaction (PCR), quantitative PCR (qPCR), loop-mediated isothermal amplification (LAMP), plasmonic CRISPR and recombinase polymerase amplification (RPA). Among all these methods, PCR has remained the standard since 2014 due to its reliability, specificity and sensitivity; however, the PCR method creates technical, financial and infrastructure barriers for laymen due to the requirement for clean spaces, expensive instrumentation, complex troubleshooting and interpretation of results.

Other DNA-based methods such as LAMP and RPA, which are conducted at a stable reaction temperature throughout the procedure, do not require the same expensive equipment that PCR requires. The results from these two methods can be achieved much faster with reaction times as short as 20 or 30 minutes. In addition, LAMP and RPA are typically considered more sensitive to the DNA they target and less sensitive to impurities in the sample.

What is LAMP?
LAMP is a molecular tool used to detect DNA, commonly used as a diagnostic method for infectious diseases of plants and animals. Since its initial discovery by Notomi et al. (2000), the LAMP method has received much interest from private, academic and government sectors as well as from growers due to the low barriers to entry. In the past two decades, new formats for LAMP have been developed, making interpretation of results even more simplistic compared to the original method which had involved a gel electrophoresis system, additional chemicals and an advanced imaging system. These new formats allow the final interpretations to be done visually without any instrumentation. For example, the GRBV-positive reactions in some LAMP formats can create turbidity or cloudiness in the reaction tube, indicating GRBV was present in the sample, but more common is a change in color using pH indicators.

Recently, Romero Romero et al. (2019) published a LAMP method for the detection of GRBV along with a simplistic “pin-prick” DNA extraction method which consists of pricking leaf blades and petioles with a pipette tip and soaking them in water for 10 minutes to complete the extraction. Furthermore, these researchers paired this DNA extraction method with a colorimetric LAMP reagent that uses a pH indicator dye to determine whether the LAMP result was positive (yellow) or negative (pink) making interpretation faster and simpler.

The pin-prick DNA extraction method being performed on grapevine leaves and dormant canes.

We were interested in comparing its sensitivity and specificity to other more commonly used methods, such as PCR, qPCR and symptom monitoring.

The Experiment Design
We compared the four methods (LAMP, PCR, qPCR and visual symptom monitoring) at four different phenological time points per year for two years at a commercial vineyard in southern Oregon. We compared these methods using fully expanded, mature leaves sampled between berry set and harvest and using dormant shoot tissue during the winter. Both tissue types were collected at three different heights in the grapevine’s canopy: low-canopy (basal), mid-canopy and upper-canopy (apical). A tissue sample consisted of four leaves (one leaf from four shoots) or four dormant shoot segments and were collected for each canopy height and for each of the 40 vines used in this study. Vines were recorded for GRBD symptoms at the time of sample collection. Tissues were either subjected to a standard lab-based DNA extraction method and tested using PCR or qPCR or were subject to a simple, no-equipment-needed pin-prick DNA extraction method paired with LAMP.

What Was Discovered
In leaf samples, the accuracy of all methods was reduced when samples were taken from higher positions within the canopy. Therefore, we will present the remaining results of this experiment from the data collected from basal samples only since this is already standard practice for most virus testing.

The sensitivity, or ability to detect a positive sample, of all four methods differed significantly at all time points and canopy heights. At berry set and veraison, both PCR and qPCR successfully detected GRBV in 98% GRBV-infected samples across both years whereas LAMP could only detect GRBV in 49% and 78%, respectively, of the same GRBV-infected vines. Only 31% of these same GRBV-positive grapevines expressed symptoms during veraison. At harvest, qPCR detected 100%, PCR detected 98% and LAMP detected 96% of GRBV-infected samples. At this stage, 94% of grapevines were symptomatic. At dormancy, where there are no leaves to observe GRBD symptoms, 96% of the dormant shoots tested positive using PCR and LAMP, and 95% tested positive using qPCR. There was no statistically significant difference in false-positive rates (the percentage of samples incorrectly testing positive) between methods.

Sampling of lower-canopy leaves for GRBV testing.

Due to the nature of this virus and its vector, some of our GRBV-negative vines became infected some time into the two-year experiment. Among the eight new infections observed, seven vines tested positive at our earliest sampling timepoint, berry set, by PCR and qPCR whereas LAMP only detected one of these vines at berry set and the other six thereafter. The eighth newly infected sample tested positive by all methods, but only at the harvest sampling.

The conclusion from this experiment was the accuracy of these three DNA-based methods very much depends on the location of the sample in the canopy. Use of lower-canopy leaf samples later into season increased the accuracy of GRBV diagnosis and reduced the variability in detectability. It is evidenced that testing with LAMP for GRBV later in the season (e.g., near commercial harvest) can yield comparable results to more standard methods such as PCR or qPCR.

More cost-effective and simple methods such as pin-prick DNA extraction and LAMP can offer a more accessible approach compared to external testing or the barriers and complexities of performing PCR in-house. While PCR and qPCR testing of GRBV remains the more accurate method when testing until veraison, this experiment suggests LAMP can serve as a useful tool for those who may be seeking alternatives to PCR testing. LAMP may be of interest for those wanting to test more routinely, closer to commercial maturity or during dormancy when foliar symptoms are absent.

Winery Feature: V. Sattui Winery Tom Davies and Dario Sattui Decarbonize and Go Organic

Dario Sattui, the owner and visionary behind V. Sattui Winery

At first glance, V. Sattui Winery President Tom Davies and Owner and visionary Dario Sattui might have seemed like unlikely candidates for leading carbon reduction initiatives and farming organically at their two Napa estates. After 43 years in Napa, they were already quite successful in their two DTC wineries. So why change?

Their popular V. Sattui winery, with its cheese shop, gourmet takeout and picnicking, has been a hit with tourists for decades, and Dario’s inspired, authentic recreation, Castello di Amorosa, a medieval Tuscan castle, is a super popular tourist draw as well. Their estate farming operation, which provides 70% of their grapes, spans 350 acres growing 26 varieties in four counties. Everything is sold direct to consumer.

But lately, they’ve crossed a new business frontier, becoming evangelists for carbon footprint reduction and for organic farming. They’re now passionate about their greener path: starting a climate club, paying employees to carpool to work and converting all their estates to organic.

As Davies tells the story, the moves were inspired by two main events.

Inspiration #1: An Eye-Opening Climate Change Talk
One event was a talk on climate change and fossil fuels by Andrew M. Isaacs, a senior lecturer at UC Berkeley’s Haas School of Business on climate change and business strategy who lives in Napa. The recipient of the Haas School of Business Sustainability Teaching Award, Isaacs consults for hundreds of companies on how businesses can take effective action on climate change.

“He gave a talk at Napa Valley Grapegrowers. That day changed me,” said Davies.
The take home message? “‘At the end of the day, it’s all about carbon.’”
Davies turned a new leaf.

“I went out and I put solar in my house, I bought an electric car. I eliminated all plastic here at the winery… And on and on.

“We started a climate club here at the winery. And we now pay people up to $10 per day to carpool, a program which has been very successful.”

Tom Davies is president of V. Sattui Winery in Napa County (all photos courtesy V. Sattui Winery.)

Inspiration #2: Local Documentary on Roundup
The second event was when a mutual friend introduced Davies and Sattui to documentary filmmaker Brian Lilla, who has been showing his documentary on Roundup and health concerns in local community screenings.

Said Davies, “We had not yet seen his film Children of the Vine. But we just thought he’d be an interesting person to talk to.”

“So, Brian says, ‘Look, I’d love for you both to see the documentary.’ So he gave us a link. Dario watched it at home. I watched it here in my office. And I think we absolutely were both taken aback…”

The film details medical and community concerns from Roundup’s critics about the controversial product’s alleged carcinogenicity which have since forced its manufacturer, Bayer, to pay out $11 billion in legal claims in the U.S.

Davies had already made the decision in late 2022 to stop using Roundup (a systemic herbicide that contains glyphosate) on the estates, so he was exploring other options including Lifeline herbicide (a contact herbicide that contains glufosinate ammonium) but wasn’t finding much data. “It’s not been studied to death as much as Roundup; there wasn’t a lot of information out there regarding Lifeline,” he said.

At the same time, Davies had already been farming organically for over a decade on a few vineyards adjacent to main roads (which enabled the company to put up signage saying those vineyards were certified organic), but those were only a small fraction of overall production.

Through the winery’s effort to implement new techniques and new equipment to integrate organic practices and eliminate chemicals, V. Sattui purchased two Monarch electric tractors.

“In the spring of 2023, I sat down [with] the vineyard team and said, ‘Okay, let’s pencil out maybe another ranch or so that we could begin the process of converting to organic.’ But then both Dario and I saw the film. I had sent Dario an email early in the morning that said, ‘Look, the only way around this dilemma is just to go organic.’

“He didn’t see my email, but called me the next day and said, ‘Let’s go organic 100%.’ So, we both came at it at the same time, but somewhat independently.

“We were almost there, but that film just kind of coalesced in my mind what we needed to be to be better stewards of our land.

“And within a period of less than a week, we decided to go 100% organic on all our ranches. So, it was pretty much a very quickly made decision, but one that we’ve fully embraced and continue to embrace today.”

The Learning Curve
Putting the plan into action began in spring 2023.
“We certainly have had our challenges this year because of that, and it’s been a quick learning curve,” Davies said, with terrain playing a major role as well as 2023’s abundant rain.

Sheep grazing is a new practice for V. Sattui Winery that it hopes to expand.

“The whole idea about farming organically is about soil health, right? That is really the name of the game,” he said.

“It’s one thing to farm organically on flatland, especially with weed control, but once you get up in the hills and rocky soils, it’s another ballgame… but we made that commitment. And that’s what we’re doing.

“Fungicide has been a big deal this past year, which was a high-pressure year for powdery mildew.”

The team has made new discoveries as well, he said, discovering hotspots that conventional chemical farming had masked, shifting to a new schedule of weekly spraying instead of spraying every other week with chemicals which led to logistical adjustments.
“We had to react quickly; that’s just the reality of farming, where you have so many tractors and so many crew members, and you need to get around in a very timely fashion. That’s just what it takes to farm.”

The Toolkit
The group implemented new techniques and new equipment to integrate organic practices and eliminate chemicals.

“For the first time this year, we brought sheep into our vineyards for grazing, and that was a great experience. We hope to expand that program,” he said.

Davies purchased some new equipment, namely two Monarch tractors and a Twister. The Twister can work well for weeding on hillsides, he said.

“We were able to take advantage of some of the rebates on these electric tractors, and we said, ‘Okay, let’s get a couple and see how they work.’ For doing sprays and stuff, they’re fantastic, even if they didn’t have quite the strengths of a traditional tractor.”

One unforeseen challenge of electric tractors: Wi-Fi connectivity. “With those tractors, we needed to get Wi-Fi connections to ranches that are in the middle of nowhere. We finally just got our Wi-Fi connection because we didn’t even have phone lines at some of those locations.

“We had some success with the Twister. But it meant that we had to come back eventually with shovels, so certainly there was an increase of labor there.”

The Results
It’s too early for Davies to assess the impacts financially overall due to the cool weather, the rain, and the newness of the practices coupled with above-average yields. “It was the coolest vintage we’ve had in 20+ years,” he said, yet his yields on some varieties were up 20% over averages over the last five years.

It also remains to be seen whether it’s profitable to farm organically on all varieties or just some varieties, he said. “It will take us many years to measure, but what I’m proud of is that we took the bold step as a winery.”

While the wineries do not currently label the wines with organic certification, since they hand-sell everything, organic is a big talking point with consumers, he said. “We really do get to talk to virtually everyone that buys our wines… we like to shout from the rooftops that we are farming organically because we’re very proud of that.

“This is just one of the ways we demonstrate our dedication and stewardship of our environment. There’s many other things we do as well, but this is really important for the sustainability of our winegrowing economy and certainly to our community and to our laborers in the fields…”

Before the plans were put into place, employee reaction was uncertain, Davies said. The vineyard crew consists of 25 year-round employees.

“Some of the team members who were watching out for the financial health of the company were not sure,” he said. “I think there was some apprehension.

“But when we made the decision, everyone was 100% on board, and our vineyard manager, David Bejar, said to me, ‘Thank you, Tom. Our crew thanks you. It just shows you really care, not only about the environment, but you care for our team members and their health.’

“And that, you know, that made me feel really good. It’s created more work for them… I think it was a real challenge for them, but even given that challenge, they stepped up and I think they feel really good about it.

“It’s certainly my hope down the road that with these healthier soils, healthier vines, we will see increased longevity. What if we were able to get another 5 to 10 years out of a Cabernet Sauvignon vineyard? That’s real money right there.”

His dream goes further.

“What if the Napa Valley was the very first wine region to become 100% fully organic? That would be such an amazing day. I think it’s certainly a very doable dream.

“What a great thing we could do for our community because we are an ag-based community, we’re a tourism-based community. Both those things have to go hand-in-hand for us too. I want to be able to sustain what we have. And if we can’t continue to get buy-in from our community, for our community to embrace us, this whole thing can kind of collapse. And I just think this is how we can become a better part of our community. And continue with this for many more generations to come.

“You don’t want to be late to the game. We can be at the forefront of that. It just puts us in a much better position for us to have our continued success here.”

2024 Grape and Wine Outlook: Complex and Varied

Vineyard mechanization and technology aim for long-term success for growers (photo courtesy Sonoma County Winegrowers.)

Karissa Kruse could easily adopt a bearish outlook for the grape and wine sector this year.
As president and CEO of Sonoma County Winegrowers, she’s well aware of the industry’s challenges, from inflated input costs and worrisome labor challenges to slowing wine demand and increasing competition from ready-to-drink alcoholic beverages.

This Sonoma County vineyard will produce high-quality grapes for world-class wines (photo courtesy Sonoma County Winegrowers.)

Yet Kruse chooses to see the glass as half full.

“We’re coming into 2024 with one of the best vintages in the history of Sonoma County,” she said. “The wineries are very excited, and the farmers are happy.”

Moreover, Kruse believes her association’s “Farm of the Future” efforts in sustainability and regenerative farming bode well for Sonoma County’s 1,800 winegrape growers and 60,000 acres of vineyards. And the organization’s new demand-building collaborations with the Houston Rockets basketball team and Landry’s, a major dining and hospitality company, also give Kruse reason to feel optimistic.

“Technology, innovation, mechanization and partnerships are all going to be drivers for long-term viability for our farmers here and everywhere,” she said.

Kruse is not alone in her positive outlook. Other California wine and grape industry leaders are similarly upbeat about the future, although the overall forecast, like wine itself, is complex and varied.

Karissa Kruse of Sonoma County Winegrowers says new initiatives and partnerships will boost viability “for farmers here and everywhere” (photo courtesy Sonoma County Winegrowers.)

“We are optimistic about 2024,” echoed Joel Peterson, executive director of the Paso Robles Wine Country Alliance, which counts 500 members, including wineries, winegrape growers and associated businesses.

“At a macro level, there are certainly some cloudy skies ahead,” he acknowledged. “You hear that people are drinking less. But we’ve got a lot of innovation here with wineries and producers.”

For example, Peterson said, Paso Robles producers are making progress in regenerative agriculture and reducing their carbon footprint. Some area wineries are moving beyond traditional glass bottles by putting more wines in alternative packaging, such as boxes or reusable vessels. Further, a new, more youthful vibe is emerging in the region with the recent development of Tin City, a collection of tin buildings south of Paso Robles. The hub of 40 tasting rooms, breweries, wineries, distilleries and restaurants has become a popular attraction.

Tapping into underdeveloped audiences holds “huge opportunity” for wine, says O’Neill’s Blaire Fraser (photo courtesy O’Neill Vintners and Distillers.)

“The other thing that’s exciting is just the growth of our reputation and presence on a national level,” Peterson said. “If you go to any restaurant in America, you’re pretty much going to find a Paso Robles Cabernet by the glass.”

The October 2023 purchase of Daou Vineyards by Treasury Wine Estates for $1 billion, he added, reflects the growing prominence of the Paso Robles wine-producing region.

“That was a big deal for Paso Robles, a fortification of our reputation,” said Peterson. “There are exciting things happening here.”

“Exciting things are happening here,” says Joel Peterson of Paso Robles Wine Country Alliance (photo courtesy PRWCA.)

Opportunities Beckon
Blaire Fraser, vice president of marketing for California-based O’Neill Vintners and Distillers, believes evolving consumer demands offer opportunity to expand sales for growers and wineries. A Certified B Corporation, O’Neill is a major player in the industry, annually producing nearly 7 million cases of wine for multiple brands.

Broad interest in sustainability is driving growth in organic wines, said Fraser. What’s more, consumers are expanding their taste horizons.

In Sonoma County, 99% of vineyard acres are certified sustainable (photo courtesy Sonoma County Winegrowers.)

“We’re seeing uptake in the light, bright whites such as Sauvignon Blanc,” she added. “In fact, O’Neill is launching a new Line 39 Organic Sauvignon Blanc in 2024.”

Fraser also sees growth potential in the tried-and-true super premium Chardonnay category. “It’s one of the largest and fastest-growing segments of wine,” she said.

Tapping into underdeveloped audiences is another beckoning opportunity. “In California, 40% of consumers are Hispanic,” Fraser said. “There aren’t a lot of brands that have tapped into that audience. That’s another huge opportunity for wine.”

An excellent vintage from last fall’s harvest has boosted spirits for many growers and vintners (photo by C. Merlo.)

Also voicing optimism is Tyler Thomas, president and winemaker at two Santa Barbara County vineyard-winery operations, Dierberg and Star Lane.

“There are a lot of great wines being made,” Thomas said. “There are still tons of people really interested in wine. And despite news about plateauing wine consumption, I don’t think it’s a slam dunk or that we should be panicking and abandoning the wine industry.”

Not Ignoring Challenges
At the same time, no one expects an easy year ahead. Vineyard pest and plant problems, including grapevine red blotch and Pierce’s Disease, persist. Labor availability and costs rank high among grower concerns. In many winegrowing areas, limited water availability remains an issue. Water shortages, for instance, have resulted in a moratorium on new plantings just east of Paso Robles.

The rising national reputation of Paso Robles wines, like this Austin Hope cabernet sauvignon, helps underpin the region’s confident outlook (photo by C. Merlo.)

“The general outlook from the grower, and even the winery side, is that 2024 is going to be a challenging year,” said Stuart Spencer, executive director of the Lodi Winegrape Commission. The organization represents 750 winegrowers in a region that accounts for some 20% of California’s winegrape production.

Supply and demand are out of balance, creating “a very competitive marketplace,” Spencer said. Lodi winegrape growers, for example, haven’t seen significant price growth over the last 20 to 30 years. The average per-ton price paid to the area’s growers is $600 to $650. Compare that to Napa’s growers, who produce far fewer grapes but can command $7,000 per ton.

“Napa has carved out a strong identity,” Spencer said. “But the large winegrape buyers don’t support the Lodi region in that way. They’re not branding Lodi or investing in it from a marketing perspective. They’ll purchase our grapes at a very low price. So, to maintain profitability, growers have responded by increasing production.”

Stuart Spencer of the Lodi Winegrape Commission foresees another challenging year (photo courtesy Lodi Winegrape Commission.)

A “COVID hangover” continues to be felt, not just domestically but globally, Spencer added. Another globally tied problem stems from the fact that some of California’s largest grape buyers are also the largest importers of bulk wine.

“If they can source a certain variety from another part of the world at a lower price, they’re going to do that,” said Spencer. “That’s keeping pressure on the industry here.”

Some see consolidation among wineries and distributors as another hurdle. While such unions can bring greater efficiencies and resources to smaller businesses, “it’s harder to get your brand recognized if you’re a small guy trying… to stand out against the big guys,” said Peterson.

A ‘Sputtering’ Market
Jeff Bitter, president of Allied Grape Growers, expects market and grower pricing pressures to continue in 2024. His outlook is shaped by his daily responsibility of selling winegrapes for the cooperative’s 500 grower-members.

Bitter sees a market burdened by the slowdown in demand that began around 2016. Consumption has lagged with the shrinking number of baby boomers, who helped propel wine sales in recent decades. Younger generations haven’t adopted wine in the same way. On top of that, a growing anti-alcohol movement has emerged. The pullback in demand has caused the grape and wine industry to lose shipments and sales volume.

“There’s a lot of opportunity out there,” says Tyler Thomas of Dierberg and Star Lane wineries in Santa Barbara County (photo courtesy Star Lane Vineyard and Winery,)

“For the last 18 months, the wine market has been sputtering,” Bitter said.

The wine market, he said, is operating in reactive mode. Retailers aren’t seeing wine move off their shelves as quickly as before partly as consumers worry about rising grocery costs. Even wines below $15 to $18 a bottle have struggled to maintain shipments. That’s led to a slowdown in purchases from distributors. They don’t want to carry excess inventory in their warehouses since higher interest rates add to their storage costs. So, distributors have adopted more just-in-time, or only-when-needed, shipments. In turn, that backs up to the wineries, where tanks stay full. And that diminishes the market for winegrape growers.
“In 2023, we saw the grape market kind of fail, particularly on red grapes,” said Bitter. “Anything that was available for sale was challenging to move at a decent price, particularly in the spot market.” In the Lodi area, he added, “tens of thousands of tons” of red grapes never found a buyer and remained on the vine after harvest.

Allied Grape Growers’ Jeff Bitter has been calling for the industry to remove 50,000 acres of winegrape vineyards (photo courtesy AGG.)

As a result of the market imbalance, Bitter has been calling for an “acreage adjustment” of 50,000 net acres in vineyard removals. That would amount to about 10% of California’s 570,000 bearing acres of winegrapes.

“That’s the only way to match what we’re producing with what the market’s going to take off our hands,” he said.

Bitter recognizes achieving those acreage reductions won’t be easy. “Developing vineyards is a capital-intensive business,” he said. “Those who have developed vineyards are slow to remove them, particularly healthy, productive vineyards. There’s that mentality that if everybody else pulls out their vineyards, I’ll be the guy who still has my vineyard when the market turns around.”

Further, there aren’t always good alternatives or profitable crops to replace vineyards. A grower’s options depend on the region and the ground farmed. “If you’re going to pull out a vineyard in Napa, what are you going to plant instead?” Bitter asks.

That’s a dilemma Monterey County understands. Over the last five years, growers there have removed nearly 3,000 acres of the county’s total 40,000 acres of vineyards because “of a lack of clarity about what the market’s going to want,” said Kim Stemler, executive director of Monterey County Vintners and Growers Association. The majority of those pulled vineyards were chardonnay and pinot, the county’s top two varietals. While some of the ground was replaced with lemon trees, the question remains.

“What gets planted?” Stemler asked. “That’s the big weight.”

Grape growers will continue to wrestle with high input costs and labor challenges (photo by C. Merlo.)

“Survive to ’25”
Spencer said Lodi-area growers are hoping just to make it through the year as they wait for the market to rebalance. “One of our growers jokingly said his motto is ‘Survive to ’25,’ and there’s a lot of truth to that,” he said. “It’s a tough time right now, and there are not a lot of good answers at the moment.”

Still, Spencer believes the Lodi area and other wine regions must be more proactive in bolstering branding efforts, developing a sense of place and story in marketing and rising above the commodity image of their grapes and wine. A closer connection between farms and the consumer would also benefit the industry, he added.

“People are not going to stop drinking wine,” he said. “It’s very much engrained in our community and our society. California and Lodi make incredible wines. We need to take ownership of that as growers and not rely on others to do it.”

Santa Barbara County’s Thomas agreed “brands need to find ways to take market share.” Digital marketing can be particularly useful.

“Even in the wholesale space, you can do direct marketing campaigns to buyers at restaurants or retail shops in Colorado or Florida, and you can do that from your office in California,” he said. “That could potentially help smaller producers maintain a toehold in the wholesale markets.”

All in all, Thomas believes the industry’s headwinds can bring fresh approaches to the grape and wine business. “It’s actually a great opportunity to shuffle the deck and for people to re-think their strategy,” he said. “It’s time to put the pandemic to bed and go forward. And this is the year to do that.”

Indian Peak Vineyard is Couple’s Self-Made Dream-Come-True

The expansive 360-degree views from Indian Peak Vineyard are breathtaking (photo by J.R. Johnson.)

It’s a two-man show at Indian Peak Vineyard in Manton, Calif. Well, to be honest and exact, it’s a one-man and one-woman show in the form of Fred and Donna Boots, who own and operate the boutique grape growing and winemaking operation at the foothills of the beautiful northern Sierra Nevada Cascades, home to the Lassen Volcanic National Forest.
Looking east from the Boots’ property, visitors see the majestic Lassen Peak, then turn around and enjoy a view that encompasses the breadth of the Upper Sacramento Valley and west to the Trinity Mountain Range.

It’s hard to beat such an experience; however, Fred explains, “Do it with a glass of Cabernet Sauvignon in your hand and it gets even better.”

When the couple bought the property on Forward Road in 1999, it was rocky, brush-covered ground. Right away, Fred began the arduous task of clearing six acres of the 10-acre property in preparation of planting a vineyard.

“Having a vineyard was something I always wanted to do,” said the self-taught winemaker. “I really never thought I’d be able to do it, but we thought, ‘What the heck,’ and decided to take the chance.”

The couple quit their jobs, Donna working for the Tehama County Conservator and Public Guardians Office and Fred a long career in construction.

“It was such hard work. It began when I was 54 years old and I could pretty much do all the work myself,” Fred said. “I planted it all myself. When I hit 60, I needed a bit of help. When I hit 65, I needed a lot of help, and now that I’m 71, I find I can do very little myself.”
However, his heart is still in it as he lives a dream come true.
With Fred getting his hands dirty, Donna has been busy running the clerical end of things.
“I do all the bookkeeping, keeping up on rules, regulations and compliance, ordering supplies and paying the bills,” she said.

By 2004, the couple built Indian Peak’s winery building and were living on the property by 2005, moving from their home in Cottonwood.

According to Fred, there are two things that brought them to the Manton area when they decided to open a vineyard.

“First is the temperatures; it can be 105 degrees [F] during the day in August and at night down to 55 degrees [F],” he said. “I like the Bordeaux varieties, and you really need big temperature swings to develop the flavors in the Bordeaux varietals.”

As Fred talks about the origins of the Bordeaux varieties of grapes in France, his love the of winemaking is palatable, right along with its hard work, sacrifices, stresses and sobering realities.

“I planted Cabernet Sauvignon and Merlot first on the six planted acres,” he says. “70% is in Cabernet, with a little of each of Cabernet Franc, Malbec, Petit Verdot, and to really mix things up a bit, I threw in some Cabernet Blanc to produce a white wine.”

Indian Peak’s grapevines thrive on the rich volcanic soils in the region.

The vineyard’s tasting room is homey and welcoming in its simplicity.

Fred says they don’t need anything fancy as the wine sells itself.

“We have had so many truly loyal customers over the years,” Donna said. “Many who have become some of our closest friends. Along with that, we have been host to people from all around the world.”

To share that point, the tasting room is home to a world map littered with dots representing people who have visited Indian Peak from across the globe.

“No two guests are the same, and we really try to make everyone feel like this is right where they need to be,” Donna added.

To keep things simple and provide the couple with the time it takes to successfully operate a vineyard and winery, the Boots live in a fifth-wheel travel trailer adjacent to the building housing the tasting room and winery.

“That provides a lot of convenience,” Fred says.

There was a time when Indian Peak had another partner in the mix, the Boots’ daughter, Christie, and her husband, Trevor, who successfully ran the marketing side of the operation.
However, when Christie passed away, life in the vineyard became a bit difficult on many levels.

Down but not out, the couple laced up their boots and kept going, serving their lovingly created wines, holding special tasting events, annual stomping of the grapes, annual blessing of the grapes and much more.

When visiting Indian Peak, guests are first welcomed by a tall, wooden statue of an Indian warrior at the entrance to the 2,400-square-foot tasting room winery.

The building contains the tasting room, offices, lab room, bottling room, bathroom and storage for tanks, barrels and wine.

The Vineyard
In Manton there are “Red, red, red volcanic soils abound.…,” thanks to volcanic Mt. Lassen, which has helped to provide 28 different soils. These are mostly characterized by gravelly loam and sandy loam found throughout the region, and the soils in general are well draining.

The top Tuscan formation created a significant aquifer within the Battle Creek watershed providing ample annual water.

Indian Peaks Vineyard has dedicated water rights from the state of California, allotted 1.3 decreed miners inches of water, equal to approximately 11 gallons per minutes (GPM). The source of the water is springs and snow melt from Mt. Lassen to the east. The water is delivered from the mountain by the Crooker-Harrison Water Ditch, which serves several neighboring properties, as well as the vineyard.

Fred and Donna Boots have enjoyed the dream of owning and operating a vineyard and winery for since 1999 when the purchased property in Manton, Calif. to develop Indian Peak Vineyard (photo by J.R. Johnson.)

The water is then distributed throughout vineyard acreage through a drip irrigation system.

American Viticultural Area
The Manton region has been designated a Vineyard American Viticultural Area (AVA) since August 2014, designating it as a wine grape-growing region in the U.S. distinguishable by geographic features, with boundaries defined by the Alcohol and Tobacco Tax and Trade Bureau (TTB) of the U.S. Department of the Treasury.

The Federal government officially sanctions the effort to identify truly one-of-a-kind winegrowing districts through its system of “American Viticultural Areas” or “AVAs.”

When appearing on a label, these legal place names impart to the consumer important information and guarantees about the wine’s origin. By law, to use one of these official site designations, 85% of that bottle’s grapes must have been grown within the AVA’s boundaries.

Fred Boot enjoys a taste of one of his Indian Peak-grown-and-produced red wines (photo by J.R. Johnson.)

Created in August 2014, the Manton Valley AVA consists of 9,800 acre and now Indian Peak Vineyard and Algian Vineyard.

Estate Bottled means the winery listed on the label owns or controls 100% of the grapes that went into the bottle, and the wine was crushed, fermented, finished, aged and bottled all in the same place, and that place must be located in the same viticultural area. Indian Peak falls under this category with Fred and Donna doing all the work to produce award-winning wines.

Winemaking
Other varietals, such as Zinfandel, Syrah and Chardonnay, are purchased by the Boots from other local vineyards in Tehama and Shasta counties.

Fred said all the wines are crushed, fermented, barrel aged and bottled on location at the winery, and he personally oversees and makes knowledgeable adjustments to the entire process.

He especially enjoys his “job” when he gets to pull the wine from the barrels to test it.
Indian Peak Vineyards has won gold, silver, and bronze medals in international competitions and at the state level for several of its wines.

Indian Peak offers free wine tasting hosted by the Boots where everyone is encouraged to bring a picnic lunch and enjoy the beauty of the surrounding Sierra Nevada.

The winery can accommodate groups of up to 30 people for special events.

Wine tasting is by the glass with a volume discount and an even larger discount for wine purchase by the case.

“I like to believe we quite possibly offer the best wine tasting available,” says Fred.
“You never know who you will meet next and how they may enlighten you or speak to your soul,” Fred said, “or just simply share a recipe sometimes in these casual conversations about winemaking, types of grapes and the benefits of growing grapes and producing wine, all with your very own hands and heart.”

Because the Boots’ are no longer spring chickens and the work of keeping up with the vineyard is difficult and never-ending, the couple has decided to call it a day and have placed Indian Peak on the market.

“Sometimes, the thought of leaving the place is really difficult, but after a hard day’s work, it doesn’t sound so bad,” Donna added. “Especially for Fred, this has been a dream come true and we wouldn’t have done it any other way. Some of our best memories are planted right here in this soil.”

Fred sits back and opens a bottle of one of his favorite Bordeauxs, pours it into a glass and offers a toast to Indian Peak Vineyard, a two-man, oops, a one-man and one-woman, never-too-old-to-take-the-chance success story.

Sustainable Story Series: Part 3 Managing Pests in Eco-Friendly Ways: Strategies from Sustainable Winegrowers

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Managers of sustainably farmed vineyards value safe pest management by using integrated pest management strategies (photo courtesy Vineyard Team.)

If you have devoted time to a home garden, you have experienced the frustration of managing weeds, insect pests, rodents and plant diseases.

Pests can cause so much damage to your months of hard work that you have to discard a sizable portion of your harvest, or even remove plants completely. They damage your precious produce, steal resources like water and nutrients, bore into plants and accelerate decay, and spread disease. To a commercial farmer, damages like these can devastate their business.

Each year, 20% to 40% of global crop production is lost to pests, costing nearly $300 billion (FAO 2019). Damages of this magnitude divert human and economic resources and compromise our food supply.

So then, what is a grower to do when they find their crop has become home to pests?
They implement an informed and tailored approach to manage their farm’s unique and dynamic pest complex, one that lessens the damage and economic burdens brought about by pests without causing harm to the ecosystem.

Managers of sustainably farmed vineyards value safe pest management strategies. They manage pests in ways that minimize economic damage to their crop, protect the environment, are safe for their workers and produce a quality end-product. This is achieved by implementing integrated pest management (IPM) strategies.

According to the United States Department of Agriculture, IPM is “a science-based decision-making process that combines tools and strategies to identify and manage pests.” This sustainable approach to pest management combines strategies from four different control categories: cultural, biological, mechanical/physical and chemical.

For an IPM strategy to be successful, a sustainable vineyard steward must have a broad knowledge of pests, their lifecycles and their habitats. With this knowledge, a vineyard manager can create a safe pest management strategy that makes the vineyard ecosystem less hospitable to pests in the first place.

Bird boxes incite in vineyards the presence of barn owls, a common and effective form of biological control for rodents (photo courtesy Vineyard Team.)

Cultural Controls
Cultural controls aim to disrupt a pest’s habitat. This reduces a pest’s ability to establish themselves, reproduce and thrive.

Many winegrowers manage powdery mildew through cultural controls. Mildew thrives in dark, damp environments. Thinning leaves on vines improves airflow and light penetration through canopies, helping to reduce mildew pressure.

Biological Controls
Biological controls use the power of nature by encouraging natural predators and beneficial insects into the vineyard to help manage pests. You can see evidence of this practice in action from a distance at nearly any sustainably grown vineyard.

Barn owls are a common and effective form of biological control used in vineyards. Farms install owl boxes throughout their vines, giving birds the perfect viewing place to spot scurrying critters and raise the next generation of gopher-getters. It is a mutually beneficial relationship that provides owls with hunting and nesting grounds and gives growers an eco-friendly way to keep rodent populations down without relying on chemical rodenticides.

Mechanical/Physical Controls
Mechanical and physical controls are direct interventions between a pest and a crop. These tools include bird netting, rodent traps, deer and hog fencing, and mulching.

Covering the ground between vine rows with a mulch material like yard waste, wood chips, straw or hay is an effective way to reduce weed pressure. The mulching blocks out light, and without light, weed seeds cannot germinate. This practice has additional benefits of reducing soil erosion, preserving soil moisture, insulating the soil from extreme heat and cold, and increasing soil organic matter.

Wolff Vineyards’ Jean-Pierre Wolff placed PVC pipes vertically into the ground at the depth of each rootstock to reduce irrigation needs and ended up with a sustainable way to also mitigate weed and vertebrate pest pressure.

Chemical Control
While chemical intervention can be necessary, sustainable vineyard stewards explore this option once the other three methods have been used. The selection and application of pesticides are done in ways that minimize possible harm to people and the environment. This means choosing safer active ingredients that don’t contaminate air, soil and water, or pose threats to humans or non-target organisms. When a sustainable grower makes targeted applications, they minimize the treated area and ensure only appropriate areas are treated.

Compounding Benefits
Because sustainable farming is holistic, growers often find that one good practice has an unexpected positive impact on another resource. This was the case for Jean-Pierre Wolff, owner of SIP Certified Wolff Vineyards in San Luis Obispo, Calif.

A cultural modification intended to reduce his irrigation needs turned out to have what he calls an “indirectly obvious” benefit: less pressure from weeds and vertebrate pests.

While redeveloping a portion of his vineyard in 2017, Jean-Pierre Wolff decided to convert to drought-resistant rootstocks. And then he did something novel: He planted them three feet into the ground.

Since a standard drip irrigation system wouldn’t be able to efficiently hydrate the deep roots, he needed to develop a system that would.

Deriving inspiration from an African palm farming technique that utilizes bamboo sticks and coke bottles for irrigation, Wolff placed PVC pipes vertically into the ground at the depth of each rootstock. Through these PVC pipes, water and fertilizer are delivered directly to the rootzone.

He compares this system to an IV. In a traditional drip irrigation system, water and fertilizer need to move through multiple layers of soil before reaching the roots. With this direct delivery method, nothing is wasted in the parts of the soil that contain no roots.
This innovative subsurface irrigation technique achieved Wolff’s original goal of reducing the amount of water required to irrigate the vines by 30% to 50%.

It also reduced the pressure of native and noxious weeds in his vineyard.

Since many weeds have shallow roots, they cannot reach the water and fertilizer that are applied three feet under the ground’s surface. This cultural practice created an environment where weeds can’t access the resources they need to securely establish themselves, and therefore cannot thrive.

Vertebrate pests have also had little success establishing themselves in the blocks of deeply planted vines. Since many rodents do not regularly dig to these depths, the subsurface irrigated blocks see far less damage. Much of a plant’s vitality relies on its root system. Root damage caused by rodents can cause lower yields and outright vine death.

Safe pest management strategies offer growers a variety of tools to help them manage complex pest issues. Wolff’s story is just one example of how sustainable winegrowers take a mindful approach to combat dynamic pest concerns in eco-friendly ways.

With heightened awareness about the environmental and social impacts of conventional agriculture, it’s no surprise 85% of global consumers have become “greener” in their purchasing decisions (Simon-Kucher & Partners 2021).

If you’re not sharing the story of your sustainably minded business, now is the time to start. Help the growing number of eco-conscious consumers choose your products by letting them know they are produced in environmentally responsible ways.

Telling your sustainable story makes your business stand out for not only recognizing the health and resource issues currently being faced but acting to address them.

Want to hear more stories about how sustainable winegrowers and winemakers are raising the bar? Next time, we’ll share the story of how an estate vineyard and winery in Arroyo Grande, Calif. made many small changes around their property that compounded to have a massive impact on their overall energy use.

Certified Organic Vineyards

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Christopher Carpenter, winemaker at Jackson Family Wines, which recently announced certification for 15 Napa vineyards as organic, says the beauty of organic vineyards lies under the vines (photo courtesy Jackson Family Wines.)

Jackson Family Wines added a significant new milestone in fall 2023: It announced certification for 15 Napa vineyards as organic, according to the Certified California Organic Farmers (CCOF), a USDA approved organic certifier. Jackson Family Wines reported the total acreage planted to vine is 480 acres.

That makes it the third largest organic vineyard owner in Napa behind the Lawrence Family’s Demeine Estates (633 planted acres) and Yount Mill Vineyards (557 planted acres).
Currently, just under 14% of Napa vines are certified organic.

“I firmly believe agriculture should lead the way in redefining our relationship with the planet as a species,” said Christopher Carpenter, winemaker at Jackson Family Wines who works with their high-end Napa brands. “This organic certification in Napa represents the initial step as we progress toward regenerative organic certification and continue to foster harmony between the natural world and the agricultural world.”

Organic vineyard acreage is increasing throughout California and Oregon (photo by Julie Johnson.)

A long-standing board member and former chair of Slow Food USA, who also started the Napa chapter, Carpenter makes the wines for four of Jackson’s Napa brands (Cardinale, Lokoya, La Jota and Mt. Brave).

Carpenter’s partner in the conversion was vineyard manager and organic farming veteran Rafael Jimenez who has been head grower at Jackson’s Freemark Abbey in Oakville for five years.

The two brought in compost (typical in organic viticulture) to increase organic matter in the solid and adopted no till farming. They also had sheep graze in the spring for weed control.
Carpenter said the beauty of organic vineyards lies under the vines.

“One of the factors of organic you’ll learn to live with is it’s not the prettiest thing in the world [i.e. there’s weeds on the vineyard floor],” he said in a YouTube video. “But if you were to open up these soils and look at what’s going on in the soil health, that’s beauty unto itself. The soils are as healthy as they’ve ever been. And what we also ultimately do is just incorporate these weeds back into the soil to raise the nitrogen level and get ready for next year’s early ripening,” he said.

His remarks were captured in a 2023 video tour of the 27-acre Wurtele vineyard in the Spring Mountain AVA.

Top Mountain Sites
Mountain vineyard sites are responsible for 554 of the certified acres, the type of terroir founder Jess Jackson famously preferred.

1. Potelle, Mount Veeder AVA | 202 acres
2. Keyes, Howell Mountain AVA | 109 acres
3. Veeder, Mount Veeder AVA | 61 acres
4. La Jota, Howell Mountain AVA | 41 acres
5. Rhyolite Ride, Diamond Mountain District AVA | 39 acres
6. Atalon, Diamond Mountain District AVA AVA | 30 acres
7. Wurtele, Spring Mountain District AVA | 27 acres
8. Lokoya, Spring Mountain District AVA | 24 acres
9. Ho, Mount Veeder AVA | 11 acres
10. Wallis, Diamond Mountain AVA | 10 acres

Grapes from these vineyards go into wines under the Cardinale, Freemark Abbey, Lokoya, La Jota, Mt. Brave and Caladan brands.

Three additional newly certified organic vineyards have historic significance since they surround the 1886 Freemark Abbey winery.

• VanZ, St. Helena AVA | 5 acres
• Ahern in St. Helena AVA | 4 acres (at Freemark Abbey)
• Freemark Abbey, St. Helena AVA | 2 acres

Its Howell Mountain La Jota wines go for $100 to $175.
Jackson also has 80 acres of vines certified organic at its Cardinale estate on the valley floor in Napa. The estate wine sells for around $350.

Lokoya is the brand that relies most on the mountain fruit from the Diamond Mountain District, Howell Mountain, Mount Veeder and Spring Mountain District appellations. Carpenter makes single vineyard designates under the Lokoya label from each of the four AVAs. They’re priced at about $450.

Jackson Family Wines’ relationship with organic grape growing has deep roots. In 2000, founder Jess Jackson hired French Rhone winemaker Philippe Armenier to plant biodynamic vines around Jackson’s home in Alexander Valley in Sonoma County. That was the same year Sonoma County neighbor Benziger Winery officially adopted biodynamics.

Armenier came to the U.S. from Domaine Marcoux, his family’s 40-acre Chateauneuf du Pape estate winery, which in 1990 was the first in the region to adopt biodynamic farming. They were later the first in the Rhone to receive a 100-point score from Robert Parker.
Though the Jackson-Armenier relationship was brief, it was notable as a sign of things to come, albeit 23 years later and in Napa organics, not Sonoma biodynamics.

More Large Organic Vineyards in Napa
Demeine Estates owns historic blue chip Napa wineries Heitz Cellar, Stony Hill, Burgess and others. Mark Neal has overseen organic vineyard management on its 633 acres (certified organic as well as biodynamic). An additional 18 acres is currently in the three-year transition period (this does not include Martha’s Vineyard (33 acres) which it sources from exclusively and is owned by a different family.)

The oldest large organic vineyard owner in Napa is Yount Mill Vineyards, owned and farmed by descendants of the Pelissa family and certified first in 1995. They sell most of the fruit from their 557 acres but retain roughly 10% for four family-owned brands.

Other big names in Napa with certified organic vines include Grgich Hills (336 acres), Inglenook (230 acres), Frog’s Leap (200 acres), Opus One (169 acres), Quintessa (160 acres), Raymond (156 acres), Stags Leap Wine Cellars (145 acres) and Robert Sinskey (115 acres). All are certified by CCOF, a Santa Cruz-based certifier, accredited by USDA’s National Organic Program (NOP), which sets the national standards.

Other leading organic certifiers in U.S. wine circles accredited by NOP are Organic Certifiers, Oregon Tilth, the Oregon Dept. of Agriculture and the Washington State Dept. of Agriculture.

Unlike sustainability certifications, organic certification is protected by federal law. Organic growers are eligible to receive grants that reduce certification fees.

Organic Leaders in California and Oregon
Outside of Napa, one of the biggest organic vineyard owners in California is WC Ag (Fred Franzia) in Ceres in the Central Valley with 1,600 acres. Others are Castoro Cellars (1,400 acres), Scheid Vineyards (667 acres with 2,000+ more planned) and grower French Camp in Santa Maria (472 acres). In 2023, Kylix Vineyards (affiliated with Grapevine Capital Partners, which has previously represented Harvard’s endowment investments) certified 485 acres of vineyards organic in Paso’s San Juan Creek AVA.

Trinchero Estates certified 183 acres in Yolo County in August 2023.

In fine wine circles, there’s Ridge Vineyards in both Sonoma and Santa Clara counties (379 acres), Daou in Paso Robles (212 acres) and Tablas Creek, also in Paso Robles (130 acres). In Santa Barbara County, Stolpman (181 acres), Sea Smoke (170 acres) and Beckmen (150 acres) lead in organic and/or biodynamic certified acreage.

In Oregon, the eco-certified list includes Momtazi Vineyard (260 acres), Montinore Estate (230 acres) and Cooper Mountain Vineyards (200 acres), which are all certified biodynamic (requires meeting organic standards as a baseline). Lemelson Vineyards has 125 acres and Domaine Drouhin will soon have 130 acres (it’s currently in the three-year transition required for organic certification.) The legendary Temperance Hill (100 acres) was one of the first growers in Oregon to be certified organic.

Rootstock Research Reaches for Drought Resistance

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Canopy of vines on GRN2 rootstock, close to harvest in 2021 drought year. Rootstocks like GRN2 are good at mining water from the soil (photo courtesy Tian Tian, UCCE.)

Vineyard rootstocks find water, scions spend water.

The relationship between the two needs to work to produce grape yields and quality, but researchers know if drought conditions persist, rootstocks that can perform on less water must be developed.

Most grapevines are grafted on a rootstock, the underground part of the plant that supports growth aboveground. Grapevines are deeply rooted with more than 25% of root biomass typically distributed below one meter.

Luis Diaz Garcia, assistant professor in grape breeding in the Department of Viticulture and Enology at UC Davis said drought resistance research is ongoing, exploring different adaptive strategies in a variety of grape germplasm and developing novel approaches to screen drought tolerance traits more efficiently. Diaz Garcia said his laboratory is using genomics, robotics, proximal sensing and artificial intelligence to increase the efficiency in identifying superior-performing vines.

These approaches, he said, can increase the number of plants evaluated in the program and reduce the time it takes to find and test the new rootstocks.

Diaz Garcia explained there are several mechanisms by which a grapevine can tolerate drought. Those include closing its stomata (small pores on the surface of the leaves that facilitate gas exchange and transpiration) to prevent water loss, limiting growth and modifying its root architecture to explore more soil area and extract water.

“The challenge is not all of these adaptive mechanisms are compatible with vineyard production systems. Therefore, understanding these mechanisms is crucial for selecting the best/most informative traits to screen in breeding programs,” he said.

The goal of the UC research, Diaz Garcia explained, is to develop new rootstocks with improved water-use efficiency and other adaptive traits such as nematode tolerance and good grafting and rooting capabilities. New root traits that help with drought resistance have been identified by UC researchers.

Drought Responses
Megan Bartlett, Department of Viticulture and Enology, said with identification of these traits, they can be amplified in new grape varieties. A UC publication outlined her study findings. Contributing to her study were researchers from University of British Columbia and the USDA-ARS Crops Pathology and Genetics Research Unit.

Bartlett’s research focused on drought responses in living root cells. Capitance, a measurement of how much roots shrink as they dehydrate, is an important trait for drought tolerance. Water stress can cause roots to shrink and pull away from the soil, losing access to any soil water. When the scion is unable to replace the water lost to evaporation, the stomata are closed to prevent severe dehydration. However, this stops photosynthesis. Rootstocks with lower capitance maintained greater gas exchange under water stress, suggesting adjustment in root structure and biochemistry to retain greater root volume could improve belowground hydraulic function under drought conditions. Bartlett’s study was the first to test whether traits measuring root shrinkage and cell collapse can capture differences in rootstock drought tolerance.

Canopy size of different rootstocks tested for drought resistance. UCCE Viticulture Advisor Karl Lund notes there is a lot of variation among rootstocks in how they handle water stress (photo courtesy K. Lund.)

Karl Lund, UCCE viticulture advisor in Madera, Merced and Mariposa counties, said most of the work in drought tolerant rootstock development is focused on the winegrape segment as there is funding available. Bartlett’s study was supported by the American Vineyard Foundation, UC Davis and by private donations.

“What does drought tolerance mean?” Lund asked. “Is it when a rootstock is good at dealing with low irrigation like 70% of ET over the season, or is it the ‘broken pump’ problem where there is no water available for a period of time, and when it is, will the rootstock recover?”

Lund explained there is a lot of variation among rootstocks in how they handle water stress. Some, he noted, are good at mining water from the soil or can find water in the soil. An example is the GRN3 rootstock’s ability to find water.

One challenge to development of a new rootstock is time. Lund said with drought tolerance in mind, first you have to grow the plant, then it takes multiple years to determine its value as drought-tolerant. Field trials for drought tolerance are also difficult to do in wet years.
In comparison, a rootstock trial for nematode resistance takes six months to two years.
Use of genetic markers to make crossbreeding selections for rootstocks can speed up the process, but the rootstock’s performance in the field for crop yield and quality also must be considered.

Scion Plays a Part
The scion grafted to the rootstock also plays a part in drought tolerance. The rootstock may find the water needed for production, but it is the scion that decides when to open stomata for transpiration. Canopy size is also controlled by both the rootstock and the scion. Larger root systems handle drought by finding water, but they also support a larger canopy.
Lund said he has found situations where a drought-resistant rootstock develops a large canopy that can still handle water stress when the rootstock and scion work as a team. Some incompatibility issues between rootstocks and scions have arisen, but Lund said viruses may play a part in that.

When choosing a grapevine rootstock, Lund said the first question is how much tonnage do you want? That figure varies depending on the region. In the San Joaquin Valley, desired winegrape tonnage is high. In the wine country to the north, lower tonnage is preferred, he said. 7 tons to the acre is too much for winegrape growers in the Napa and Sonoma growing regions; they prefer about 3 to 5 tons per acre and desire a lower-vigor rootstock.