Posts Tagged: environment

Unique conditions in Modoc County drive organic agriculture adaptations

UC Organic Agriculture Institute visits area to hear innovations, needs of local producers

Modoc County, home to 8,500 people and tucked in the remote northeastern corner of California, has been a leader in advancing organic agriculture through its significant ranching and agronomic crop production, namely of potatoes and hay.

In fact, Modoc County is California's number one county for organic beef cattle production (119,782 acres in 2022), and consistently in the top five counties for total harvested certified organic acres in the state, according to the most recent California Department of Food and Agriculture statistics.

“Modoc County farmers and ranchers in many ways exemplify the values of organic agriculture, adapting and tailoring their operations to the contexts of the unique landscapes we live in,” said Laurie Wayne, University of California Cooperative Extension nutrition, community health and food systems advisor for Modoc, Siskiyou and Lassen counties.

This past summer, Wayne and Rob Wilson – UCCE farm advisor and director of the Intermountain Research and Extension Center operated by UC Agriculture and Natural Resources – shared their insights with a visiting team from the UC Organic Agriculture Institute.

Established in 2020 as an institute under UC ANR, OAI was created to develop research, extension and education support for certified, transitioning and aspiring organic farmers and ranchers across California. The OAI team has been visiting different regions to better understand the unique conditions of organic agriculture in those areas.

“These tours are our chance to build relationships with local farmers, partner organizations and colleagues and see how organic agriculture has grown and developed in that specific region,” said Houston Wilson, OAI director. “We also get to learn directly from farmers and ranchers about how regional contexts and community goals influence organic agriculture in their area.”

Modoc County's geography, climate spur adaptive strategies

Wayne, who previously operated a farm in Modoc County and also co-founded the Surprise Valley Saturday Farmer's Market and Modoc Harvest Food Hub, was the perfect person to introduce the OAI team to local agricultural producers.

“I hoped to show our visitors just a glimpse at the many lessons I've learned and inspiration I've gained from the agriculture community in Modoc,” Wayne said.

A common theme across Modoc County is the use of innovative and place-based strategies to farm within diverse ecosystems. For example, extensive rotational grazing is well-suited to the region's vast sage steppes, perennial grasslands and sagebrush ecosystems.

333 Ranch – a third-generation ranch in Lake City owned and operated by Sophie Sheppard, Lynn Nardella, and their son, Jason Diven – raises rotationally grazed beef cattle and calves, hogs and Icelandic sheep and grows organically managed vegetables.

Half of 333 Ranch is under conservation easement to preserve natural resources and wildlife. Their land stewardship practices include working with the Savory Institute – a nonprofit that supports the health of grasslands and the livelihoods of people on those landscapes – on ecological grazing techniques. They also partner with the USDA Natural Resources Conservation Service to convert barbed wire fencing into high tensile fencing for riparian habitat restoration. Sheppard reported that one year after the fence conversion, the ranchers saw nesting Greater Sandhill Cranes and beavers building dams in their creek.

Leah Larsen of Bidwell Canyon Farm in Fort Bidwell said she learned high tunnel production from Sheppard at 333 Ranch and others in the area. High tunnels allow farmers to extend their growing seasons to accommodate diverse crop rotations and opportunities for local food production.

Larsen – who grows vegetables, fruit trees and berries on 1.5 acres (including in two high tunnels) – also raises milk goats and chickens, maintains grazing pasture and operates a farmstay rental. With 11 years of experience farming in Modoc's high desert climate, Larsen offers mentorship to other growers in the region and shares information through channels such as the region's high tunnel Facebook group.

Canyon Creek Ranch in Alturas uses prescribed burns to manage invasive tree species in the sagebrush steppe. Richard (Dick) Mackey and his family operate 3,300 certified organic acres, with 350 head of cattle and 500 acres of hay, pasture and alfalfa. In addition to organic certification, Canyon Creek Ranch is also Ecological Outcome Verification (EOV)-certified; EOV is a program of the Savory Institute that gathers ecosystem data to verify that ranching practices are regenerating the land.

Mackey, whose family has owned and operated the ranch since 1946, brought the OAI team to an area of their property that is managed with fire, demonstrating how their agroecological stewardship has improved the land and suppressed invasive species.

“It was remarkable to see the difference ecological management such as prescribed burning and targeted grazing can make in promoting both healthy ecosystems and more productive organic agricultural systems,” said Krista Marshall, OAI policy and partnerships coordinator. “I feel incredibly grateful to have gotten the opportunity to learn from the innovative and thoughtful farmers and ranchers across Modoc County about how we can accomplish multiple goals in agroecosystems.”

Another example of ecological and agricultural goals being met simultaneously can be found at Tule Lake, where rotations incorporate a wetland wildlife refuge and crop production. Rob Wilson noted that this “Walking Wetlands” program has benefited organic producers with good pest and disease control from the flooded years in the rotation.

“The Walking Wetlands program is a great example of public and private land managers working together to meet land use objectives,” said Wilson, the UCCE farm advisor. “The program results in hundreds of acres of restored marshland habitat for migrating waterfowl each year, while providing organic potato and small grain growers with productive farmland largely devoid of soilborne pathogens and nematode pests.” 

Farm labor support, meat processing infrastructure investment needed in region

All ranchers on the OAI tour commented on the lack of U.S. Department of Agriculture-accredited meat processors in the county. Ranchers explained that they must transport animals hundreds of miles to other counties or across state lines to access facilities.

Jon and Kelsey Arreche of Cow Creek Meat, Inc. at Arreche Farms in Cedarville said that the year-long wait lists for processing complicates planning.

The Arreches manage 1,300 acres of pasture, alfalfa, wheat, barley and hay and raise 110 grass-fed and grass-fed/grain-finished beef cattle, as well as hogs, lamb and poultry. Cow Creek Meat was certified organic for 12 years and continues to farm organically despite not pursuing certification currently.

Jon Arreche commented that prices for commodities like alfalfa are not stable but rather fluctuate between organic and non-organic markets, with some years offering a better premium than others. He said that they may pursue certification again in the future.

“Greater investment in processing infrastructure and the need for organic market development are two concerns we heard consistently on the tour,” said Shriya Rangarajan, a postdoctoral researcher with OAI. “We have to ensure the long-term economic viability for these local ranchers.”

The remoteness of Modoc County also has contributed to labor challenges for farmers and ranchers across the region. Some growers have pursued hosting farm apprenticeships or internships, through programs like World Wide Opportunities on Organic Farms (WWOOF) or through direct hire.

Bidwell Canyon Farm has a farm internship program, which helps with labor on the farm and also contributes to mentoring and teaching the next generation of farmers. There was widespread interest in developing training programs, akin to Rogue Farm Corps in Oregon, to link beginning farmer apprentices with host mentor farmers.

“Hands-on experience working on farms is the best way to inspire and train the next generation of farmers,” said Marshall. “Farmers in Modoc are already creating these types of apprenticeship programs on their farms, so network and capacity building to support these efforts would benefit the agricultural community.”

Markets often dictate whether organic certification is useful

The number of certified organic farms and ranches in Modoc County declined from 34 in 2018 to 19 in 2022, according to CDFA statistics. The OAI visitors learned from growers in the region that markets often dictated if formal certification made business sense for their organically managed operations.

Kay and Erik Antunez de Mayolo grow vegetables, herbs, berries and natural dye plants on a quarter-acre and heritage apples, peaches and other fruit trees on an additional three acres at Oz Garden in Eagleville. They manage their farm organically, but are not certified. Kay Antunez de Mayolo, who markets produce and value-added goods at the Surprise Valley Farmers Market in Cedarville and the Alturas Farmers Market, also contributes to the Modoc Harvest Food Hub.

Most Modoc growers, certified or not, know their customers through direct sales and build trust around the integrity of their operations. Many farmers and ranchers ultimately don't see the financial benefit of certification because of these direct relationships with their customers – especially given the certification cost and administrative effort required.

While cost-share programs for organic certification fees exist (such as the USDA Organic Certification Cost Share Program), applying for and maintaining certification status takes valuable time – in addition to direct financial outlay.

Modoc growers contribute to conserving plant diversity

The lively local food and farming community in Modoc County also includes smaller-scale vegetable and fruit farms; the State Organic Program reported 1,281 organic vegetable acres in Modoc in 2023. Modoc fruit and vegetable growers are conserving heritage crops on farm and preserving unique plant varieties while producing food for the community.

At Oz Garden, the apple trees are over 125 years old. Through the Modoc Harvest Heritage Fruit Tree Project, Kay Antunez de Mayolo and others work to identify these cultivars through research and DNA fingerprinting at the UC Davis Genetics Lab. Oz Garden grows diverse plant varieties, including the “Old Fashioned Surprise Valley Tomato,” a locally adapted beefsteak variety stewarded by Modoc resident June Perry.

Bidwell Canyon Farm introduced the OAI team to honeyberries, also known as Haskap berries, which look like an elongated blueberry but have a distinct honeyed flavor and produce well in Modoc County.

“That bit of honeyberry was symbolic of the entire tour – a small but memorable taste of the richness and diversity of Modoc County organic agriculture,” Marshall said. “We are so grateful to Laurie and all the farmers and ranchers for taking the time to share their experiences and feedback with us.”

Feeding grazing cattle seaweed cuts methane emissions by almost 40%

Findings offer solution for more climate-friendly cattle farming

Seaweed is once again showing promise for making cattle farming more sustainable. A new study by researchers at the University of California, Davis, found that feeding grazing beef cattle a seaweed supplement in pellet form reduced their methane emissions by almost 40% without affecting their health or weight. The study was published Dec. 2 in Proceedings of the National Academy of Sciences.

This is the first study to test seaweed on grazing beef cattle in the world. It follows previous studies that showed seaweed cut methane emissions 82% in feedlot cattle and over 50% in dairy cows.

How much methane do cattle produce?

Livestock account for 14.5% of global greenhouse gas emissions, with the largest portion coming from methane that cattle release when they burp. Grazing cattle also produce more methane than feedlot cattle or dairy cows because they eat more fiber from grass. In the U.S., there are 9 million dairy cows and over 64 million beef cattle.

“Beef cattle spend only about three months in feedlots and spend most of their lives grazing on pasture and producing methane,” said senior author Ermias Kebreab, professor in the Department of Animal Science. “We need to make this seaweed additive or any feed additive more accessible to grazing cattle to make cattle farming more sustainable while meeting the global demand for meat.”

Difficulty in reducing methane emissions from cattle

Kebreab said that daily feeding of pasture-based cattle is more difficult than feedlot or dairy cows because they often graze far from ranches for long periods. However, during the winter or when grass is scarce, ranchers often supplement their diet.

For this study, researchers divided 24 beef steers (a mix of Angus and Wagyu breeds) into two groups: one received the seaweed supplement, and the other did not. Researchers conducted the 10-week experiment at a ranch in Dillon, Montana. Since these were grazing cattle, they ate the supplement voluntarily, which still resulted in a nearly 40% cut in emissions.

Most research studies to reduce methane emissions using feed additives have taken place in controlled environments with daily supplements. But Kebreab noted in the study that fewer than half of those methods are effective for grazing cattle.

“This method paves the way to make a seaweed supplement easily available to grazing animals,” said Kebreab. “Ranchers could even introduce the seaweed through a lick block for their cattle.”

Kebreab said pastoral farming, which includes large grazing systems, supports millions of people around the world, often in areas vulnerable to climate change. This study suggests a way to make cattle grazing better for the environment, while playing a role in fighting climate change.

A related article in the same PNAS issue highlights the need to improve the efficiency of livestock production in low- and middle-income countries using better genetics, feeding and health practices. UC Davis Professor and Cooperative Extension Specialist Alison Van Eenennaam, the article's author, said it is the most promising approach to meet the global demand for meat while limiting greenhouse gas emissions.

Other authors of the seaweed study include UC Davis postdoctoral researchers Paulo de Méo Filho and John-Fredy Ramirez-Agudelo.

The research was supported by Matador Ranch in Dillon, Montana.

This article was first published on the UC Davis news site.

UC ANR experts, resources guide response to shothole borers in Bay Area

UC Cooperative Extension scientists, partners managed invasive beetle in Southern California

Late in 2023, a potentially devastating beetle was detected in the San Francisco Bay Area for the first time. But land managers, arborists and agency staff have one big advantage as they devise plans to control the invasive shothole borers (ISHB).

Thanks to collaborations led by University of California Agriculture and Natural Resources, they can draw upon the hard-earned experience of their colleagues in Southern California. Over the past decade, SoCal communities have lost “tens of thousands” of trees due to ISHB infestations, according to Beatriz Nobua-Behrmann, UC Cooperative Extension urban forestry and natural resources advisor for Los Angeles and Orange counties.

In one regional park, about 500 trees had to be removed in the span of just one year. “That kind of impact happened in many locations; a whole street might lose 90% of the trees – all of a sudden,” said Nobua-Behrmann, a member of a statewide network studying ISHB.

Spurred by such severe impacts, UC scientists have been studying ISHB and testing various control measures since about 2012. Their lessons are now informing efforts in San Jose – where the first case in the Bay Area was detected in November 2023 – and across the region.

“The UC ANR team is comprised of subject-matter experts,” said Drew Raymond, interim agricultural commissioner for Santa Clara County. “The team has compiled all of the experience from the agencies that have been doing work in Southern California and transplanted that experience here to Northern California.”

Lucy Diekmann, UC Cooperative Extension urban agriculture/food systems advisor, and Igor Lacan, UCCE environmental horticulture and urban forestry advisor, have coordinated regular meetings and trainings of Bay Area agricultural officials, land managers and arborists.

“Lucy and Igor have been instrumental in organizing our partners to establish an effective plan for shothole borers,” said Sara Davis, city forester for San Jose. “Because experts across the broader UC ANR network have many years of firsthand experience with this invasive pest, we are able to draw on their practical know-how to guide our monitoring, management and public education efforts.”

Davis is leading a trapping program in San Jose to determine how widespread ISHB is. Aside from a recent detection in the Santa Cruz Mountains, almost all of the approximately 30 confirmed cases in Northern California have been clustered along the riparian corridor of Coyote Creek through downtown San Jose. This pattern of intense but geographically limited damage was also seen across Southern California – notably in San Diego County along the Tijuana River Valley, where ISHB wiped out the willow population.

“I would expect us in the Bay Area to see this type of localized damage that is not fundamentally different from what they're seeing in Southern California,” Lacan said.

Unusually troublesome pest triggers deadly tree disease

The invasive shothole borers – a term for two species that are virtually indistinguishable, the polyphagous shothole borer and Kuroshio shothole borer – were first detected in Los Angeles in 2003. The tiny beetles, measuring 1.5 to 2 millimeters in length, became a major concern a decade later when swaths of urban forest began dying across LA County.

Infestations are harmful – and fatal for at least 17 tree species in California – because the fungus that the beetle “farms” as its food source causes a disease called Fusarium dieback. Alarmingly, ISHB make their home in a wide variety of trees; Nobua-Behrmann said 65 tree species in California have been identified as “reproductive hosts” where they can grow their populations.

“The fact that they are such a generalist species means that they can find a host almost anywhere,” she said, noting that sycamore, box elder, cottonwoods, oaks and willows are favorites of ISHB.

Furthermore, typical tools in the integrated pest management toolbox are unavailable or ineffective for this invasive beetle. Unlike most insects, these shothole borers mate with their siblings before leaving the tree, so they don't need to search for mates afterward. This means they are not attracted to the pheromone traps typically used for pest control; traps used for ISHB only work to track their numbers, not reduce them.

“Their biology limits what we can do,” Nobua-Behrmann said. “Since the beetles spend most of their lives inside the trees, it's also hard to reach them with insecticides.”

Largely hidden within trees, ISHB can build up their numbers, undetected for years. A tree with green and plentiful leaves may in fact be harboring a significant infestation. “It's easy for this beetle go under the radar and create a big population and a big problem before you even notice,” Nobua-Behrmann said.

Monitoring and early identification of infestations are crucial

Given this pest's elusive nature, monitoring and early intervention have proven to be essential in Southern California.

“All of the success stories have a major component of monitoring and detection; if you have a good monitoring program and you can quickly identify the trees that are infested, timely action can make a big difference,” said Nobua-Behrmann, citing Disneyland in Anaheim as one example where frequent surveys and robust monitoring prevented major impacts.

As most municipalities don't have the abundant resources of a world-famous theme park, Nobua-Behrmann pioneered a program in Southern California to train community members on recognizing telltale signs of the beetle. Specifically, they looked for its entry holes, which have a characteristically round shape and size, comparable to the tip of a ballpoint pen.

Beginning with UC Master Gardeners and UC California Naturalists and then members of the general public in LA and Orange counties (and later other SoCal counties), the program trained about 100 people on how to look out for the beetle. After verification by experts, volunteers were found to be nearly 90% accurate in identifying ISHB.

Although the volunteer monitoring program is on hiatus, Nobua-Behrmann said it had clear benefits that could potentially help other regions. “It would be great to get this program going in Northern California and hopefully get volunteers and people in the general public to help identify infestations there as well,” she said.

Statewide ISHB network spreads essential information

In addition to coordinating an in-person public training in San Jose in April, Lacan and Diekmann, the UC Cooperative Extension advisors, have been educating local UC Master Gardeners on how to spot signs of the invasive beetle.

For about a decade, Lacan has been warning people about the possibility of ISHB in Northern California, routinely including shothole borers in his presentations on “tree pests to watch.” “I've been doing this since before ‘day zero,' but there was not a whole lot of interest in ISHB, as you might imagine,” Lacan recalled. “But then all of that changed in fall of last year.”

In the past year, Lacan has done a dozen ISHB presentations, workshops and webinars, attended by a total of about 260 people – predominantly city foresters, land managers, production arborists and members of tree-related nonprofits.

Lacan noted that the most effective presentations have been at in-person events featuring UC ANR-affiliated experts such as Nobua-Behrmann, UCCE environmental horticulture advisor emeritus John Kabashima, and ISHB program staff Randall Oliver and Hannah Vasilis.

“Here is where we tap into our network,” Lacan said. “This is the power of the statewide shothole borers program.”

Another vital asset has been the collection of practical resources gathered by the ISHB program, the UC Integrated Pest Management team and partner organizations. One example is a deck of identification cards depicting how symptoms of infestation differ from species to species. Such detailed information can help managers determine whether a tree is truly infested – and thus allocate their limited resources more judiciously.

“These very specific, very seriously considered materials are the kind of thing that people really appreciate,” Lacan said. “It's not just a generic ‘it's kind of like this.'”

The symptoms, broken down by tree species, are also listed on the ISHB website. Raymond, the interim agricultural commissioner for Santa Clara County, said his team uses the website to get informed about ISHB and regularly refers community members to it.

“The ISHB website has been a great resource,” Raymond said. “It's full of important and user-friendly information.”

Communities learn to protect trees, adapt to shothole borers

If community members believe a tree is infested, they should review the symptoms of ISHB-Fusarium dieback. If the signs match what they are seeing, they should take a photo of the entry hole (with the tip of a ballpoint pen placed next to the hole as reference) and send images to their county agricultural commissioner's office or local UCCE advisor, who may then seek confirmation.

Extra eyes on urban forests are crucial to help experts identify potential “amplifier trees” – heavily infested trees, with more than 150 entry holes, that are often repeatedly reinfested by subsequent generations of beetles. They contribute to the recurring pattern of severe but localized infestations seen across Southern California – and now in San Jose.

New research suggests that removing severely infested trees – or just the most impacted limbs of those trees – can significantly lower the overall ISHB population and help less-infested trees in the area recover over time.

“You're not going to eradicate ISHB (at least not in Southern California); you're not going to get rid of them – you're going to have them forever,” Nobua-Behrmann said. “But you can keep them at a manageable amount.”

She also emphasized other actions the public can take to prevent the spread of ISHB, such as correctly disposing infested plant material – ideally chipping it to less than an inch in length (or as small as possible) and then composting the chips.

“It's also important to not move firewood and instead buy it where you will be burning,” Nobua-Behrmann said. “It's one of the best things people can do to protect trees from invasive pests.”

After identifying and removing amplifier trees, land managers and landscape arborists should have a plan for replanting, Lacan added. He said they should prioritize species that are less susceptible to the beetle, using his Pest Vulnerability Matrix tool that lists the major pests for different mixes of trees.

“We need to figure out how to have sustainable urban forests, even with this pest,” he said. “We know we can do it, largely thanks to our colleagues in Southern California. So the key lesson is to replant soon – choose smartly, but replant right away.”

UC ANR project to help underserved farmers in SoCal with land ownership

San Diego County has more than 5,000 small farms but less than 2% are operated or owned by Black, indigenous, or people of color – including those of Asian, Hispanic or Native Hawaiian/Pacific Islander descent, according to the 2022 Ag Census.

The reasons vary, but historically, multiple marginalized communities of color have not received the same opportunities or support for land ownership or management as their white counterparts.    

Chandra Richards, University of California Cooperative Extension land equity academic coordinator for the Southern California region, is identifying barriers to equity when it comes to addressing land access, tenure, management and opportunities to increase the diversity of land managers and land ownership in the region.

Richards is the principal investigator for the Climate Action and Land Equity (CALE) project administered through UC Agriculture and Natural Resources and funded by the Department of Conservation. CALE aims to engage historically underrepresented communities in coalition building, capacity assessment and climate action planning. CALE elevates knowledge about the challenges and opportunities to land access and management for a diversity of land managers.

Among the challenges is land tenure, an established agreement between a landowner and tenant, outlining the purpose and use of the land over a period of time. However, when landowners decide to sell their land, these agreements are at risk of being null and void, forcing the tenants to renegotiate or discontinue their operation.

Land tenure leases for under five years are considered short-term, which are common in Southern California. For small, new and under-resourced farmers, landowner turnover doesn't just threaten their business plan but their livelihood.

For small farmer Byron Nkhoma, who leases land in Ramona to grow leafy greens and vegetables, the possibility of losing land is a constant worry. Since 2015, Nkhoma and his wife, Joyce, have been renting four of 20 acres to establish Hukama Produce. Over nine years, they have had two landowners. Before the land was sold to his current landowner, Nkhoma said he considered buying land, but the process proved more challenging than he thought.

“What it takes for someone like Byron to find a place to farm and establish a food system is an extremely involved process,” said Richards. “It's not just learning how to obtain land, it's also about managing that land so it can be used for years and generations to come.”

Originally from Zimbabwe, Nkhoma is adamant about taking care of the land he leases and has applied knowledge from his home to ensure resilience. Hukama Produce prides itself in improving environmental health through sustainable farming practices such as compost and mulch application, drip irrigation and low till. An important pillar of the CALE project includes building capacity and providing technical assistance toward land conservation and climate resiliency.

In addition to land tenure, money and time are stressors for small farmers. When they are not working on the farm, Nkhoma and his wife are researching and applying for grants to improve their soils and protect their crops from pests. However, many grants for which Hukama Produce is eligible often have pressing deadlines that demand their immediate attention – cutting into valuable time that could be spent tending to the land or selling at farmer's markets.

Two of Hukama's goals include building and sustaining trust in the market and growing their operation. By partnering with Richards, Hukama Produce has direct access to technical assistance focused on grant writing and conservation to increase ecosystem health and build tenure.

Agricultural land tenure is the arrangement, rights, and responsibilities centered around use, management, and ownership of agricultural land and resources. Building land tenure means that farmers have a stable place to grow their crops and build environmental sustainability without risk of having to move their operations.

While the CALE project boosts support for historically underserved community members hoping to own or manage land, it prioritizes land use for food production as a reinvestment into the greater community.

Eager to bring realities like Nhkoma's to light, Richards partnered with Keith Nathaniel, UCCE director for Los Angeles County, who co-coordinated the Western Extension Leadership Development conference held in San Diego the week of Sept. 23-27. WELD unites Cooperative Extension faculty, agents, advisors, educators and specialists from the western region of the United States for a two-year leadership development program.

While in San Diego, WELD participants joined Richards for a tour of Hukama Produce and learned directly from Nkhoma about opportunities and threats as a small farmer. The tour ended with participants in a circle, sharing how their professional roles can offer support to Hukama Produce and other small farms.

“We grow food so that we can feed the community,” said Nkhoma. “When we feed others, we build relationships. That's what ‘hukama' means – to grow relationships.”

If you operate or know of a small farm in Southern California and would like to be involved with or receive regular updates about the CALE project, please contact Chandra Richards at cmrichards@ucanr.edu.

If you are interested in applying for the Land Equity Project Manager position, please visit https://ucanr.edu/About/Jobs/?jobnum=2894 for details. 

White House Summit explores impact of extreme heat, ways to adapt

UC ANR Small Farms Network supports small-scale and underserved farmers impacted by extreme heat

Ruth Dahlquist-Willard, interim director for the UC Sustainable Agriculture Research and Education Program, joined more than 100 participants from across the country at the first-ever White House Summit on Extreme Heat. Community representatives and practitioners met with federal agency representatives and Biden Administration officials to discuss successful locally tailored, community-driven practices to adapt to extreme heat as well as available federal resources.

According to the National Oceanic and Atmospheric Administration or NOAA, summer 2024 was California's warmest summer on record. As California's climate is changing, episodes of extreme heat are becoming more common, leading to substantial health, economic and ecosystem impacts. 

In the agricultural sector, extreme heat events can cause heat illness in farmworkers, crop losses and changes in pest pressure. California crop losses due to drought, wildfire and heat were estimated at $239 million in 2023. 

Disaster relief funds are available to help growers recover from lost production due to extreme heat. Since 2021, the UC ANR Small Farms Network has connected small-scale farmers with over $5.8 million in direct-to-producer relief funds for losses related to drought, flooding and other extreme weather events.

To further support small-scale farmers in adapting to the changing climate, Dahlquist-Willard and the Small Farms Network are evaluating how the extreme heat of summer 2024 impacted farmers. Farmers reported anecdotal observations that included:

• Shifting work hours to cooler parts of the day
• Closing farm stands and farmers markets due to extreme heat
• Crops ripening more quickly than expected, impacting harvesting and packing schedules
• Poor fruit set due to extremely high temperatures 

The team is working to determine what damage symptoms on small-acreage California specialty crops can be attributed to extreme heat based on scientific literature and assessments from UC ANR colleagues. Understanding the impact of extreme heat on the farming community can help inform research and policy, ultimately equipping farmers with strategies to adapt to extreme heat events. 

“It was inspiring to meet with leaders from around the nation who are working to support communities impacted by extreme heat and learn about the creative solutions they are implementing,” said Dahlquist-Willard. “The challenges faced by these communities make it all the more important to continue to work against climate change by reducing greenhouse gas emissions, as well as to develop new methods and resources to mitigate the effects of extreme heat and other climate impacts.”  

The Extreme Heat Summit highlighted the Biden-Harris Administration's investments in climate reliance and put forth an Extreme Heat Call to Action calling upon public and private sectors to prepare for future extreme heat events. Communities and governments interested in participating are asked to use all available tools to protect people from extreme heat. Approaches and tools which could be used to protect people and resources from extreme heat are highlighted in the U.S. Climate Resilience Toolkit and the National Heat Strategy. Submissions for the Call to Action will be accepted through Nov. 1, 2024.

Further reading: 

Heat Illness Prevention, UC Davis Western Center for Agricultural Health and Safety

Pathak et al., 2018. Climate Change Trends and Impacts on California Agriculture: A Detailed Review

UC's New Climate Action Goals: Frequently Asked Questions

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