University of California, Division of Agricultural and Natural Resources

Electric Tractors Reduce Carbon Emissions at UC ANR Research and Extension Centers

Zero-emission tractors perform many tasks of diesel tractors, without noise or exhaust

By Pam Kan-Rice, UCANR

The University of California, a national leader in sustainability, has pledged to become carbon neutral by 2025. To reduce its reliance on fossil fuels, UC Agriculture and Natural Resources has replaced several of its diesel-powered tractors with electric tractors at its research and extension centers.

Seven of the nine UC research and extension centers – Intermountain located in Siskiyou County, Hopland in Mendocino County, Kearney and West Side in Fresno County, Lindcove in Tulare County, Desert in Imperial County and Hansen in Ventura County – started using the Solectrac e25 in July. The researchers plan to share what they learn from using the electric tractors.

“Charging is easy, we are using a standard 110V connection, no charging station needed,” said John Bailey, director of the University of California Hopland Research and Extension Center. “For faster charging, you can use a 220V connection – again, no charging station needed, just a regular receptacle – but we haven’t gone there yet.”

The electric tractor runs for about five hours, depending on the type of use and the speed, on a charge.

“We will use the electric tractor to mix the soil for planting trees in the greenhouse,” said Ashraf El-kereamy, director of UC Lindcove Research and Extension Center in Exeter, which focuses on citrus research. “Also, for pulling the trailer with the fruit bins during harvest, it will be good as it does not emit any gases.”

The electric tractor is being used to move materials in the loader at UC Hopland REC. “It has worked well for this, functioning similarly to a standard diesel tractor,” said Bailey.

“We have also used it to clean our sheep barn, scraping the pens to get ready for lambing season,” Bailey said. “This involves pushing or dragging straw bedding and manure. The tractor functions well in tight spaces due to its compact size.”

Bailey learned one downside is that the front end is a little too light, making it difficult to generate enough downward pressure with the loader to effectively scrape the floor without reducing the front wheel traction.

“We are planning to add some weight to the front, a standard practice with tractors to increase traction. The tractor has the mounting to enable this so it should not be a big deal,” Bailey said. “Our operators really appreciate the lack of noise and exhaust, especially when working in the barn or in tight spaces.”

The small electric tractor is also being used in tight places at the UC Intermountain Research and Extension Center in Tulelake.

“The tractor that we obtained from the company is too small for the majority of our farm needs,” said Rob Wilson, Intermountain REC director. “We purchased a small box scraper and rototiller for the tractor and we are using it around our facility grounds. We also use it out in the field in tight spaces that are too small for our larger tractors to operate.”

“The tractor is quiet, powerful for its size and operates very similar to the diesel-powered tractors with regard to the controls, hydraulics and three-point assembly. The tractor also has a lot of torque and speed.”

Annemiek Schilder, director of UC Hansen Agricultural REC, added, “I think another advantage is that the tractors can go very slowly, which is helpful for some uses such as harvesting.”

The researchers will continue to evaluate the electric tractors throughout the year.

“Our main usage will come in the spring, mowing around our headquarters and on roadsides,” Bailey said. “We are purchasing a 4-foot flail mower that can mount to the rear PTO, but won’t really put it into use until April.” The power take-off, or PTO, is the shaft that transfers power from the tractor to the attachment.

Other benefits of electric tractors include no engine oil to change and no diesel fuel.

“If the farmer already has solar, they will see close to zero fuel charges,” Bailey added. “Even without solar, their fuel costs should be reduced depending on local electrical cost. Also, the engine only has one moving part compared to dozens in a diesel tractor so maintenance costs should be reduced significantly, something that is proving true in electric cars.”

The Solectrac e25 tractors each cost $27,999 and the optional loader was about $4,000.

The California Air Resources Board is offering incentives to buy zero-emission equipment through its Funding Agricultural Replacement Measures for Emission Reductions Program. FARMER provides funding through local air districts for agricultural harvesting equipment, heavy-duty trucks, agricultural pump engines, tractors and other equipment used in agricultural operations.

2022-08-30T10:21:20-07:00August 30th, 2022|

UC Study Breaks Down Costs of Growing Organic Strawberries

By Pam Kan-Rice, UCANR

Thinking about commercially growing organic strawberries on the Central Coast?

To help prospective and current growers evaluate financial feasibility, the University of California has estimated costs to produce and harvest organic strawberries for fresh market in Santa Cruz, San Benito and Monterey counties.

“This revise of the last cost-of-production study incorporates the newest in labor costs along with updates on cultural techniques,” said study co-author Mark Bolda, UC Cooperative Extension strawberries and caneberries advisor in Santa Cruz, San Benito and Monterey counties.

The new study, “Sample Costs to Produce and Harvest Organic Strawberries in the Central Coast Region-2022,” has been released by UC Agriculture and Natural Resources and UC Davis Department of Agricultural and Resource Economics.

The analysis is based on a hypothetical well-managed organic strawberry farm using practices common to the region, but the costs, materials and practices shown in this study will not apply to all farms. Growers, UC Cooperative Extension farm advisors and specialists, pest control advisers and others provided input and reviewed the methods and findings of the study.

“Current growers can use it as a baseline to compare with their own cost and returns estimates to make sure they have an accurate picture of the profitability of their organic strawberry enterprise,” said co-author Brittney Goodrich, UC Cooperative Extension agricultural economics specialist. “Many agricultural lenders use these studies as a baseline to determine whether to approve operating or investment loan requests from current and potential strawberry growers.”

The researchers assume a farm operation size of 30 contiguous acres of rented land, with strawberries are planted on 27 acres. The study includes a list of suitable strawberry varieties for the region, but no specific variety is used in the study. The crop is harvested by hand and packed into trays containing eight 1-pound clamshells from April through early October, with peak harvest in June through August.

The authors describe the assumptions used to identify current costs for production material inputs and cash and non-cash overhead. Ranging analysis tables show net profits over a range of prices and yields. Other tables show the monthly cash costs, the costs and returns per acre, hourly equipment costs, and the whole farm annual equipment, investment and business overhead costs.

The study’s expanded section on labor includes information on California’s new minimum wage and overtime laws.

“It’s reached a wider audience this time through presentations of the material to students at Cal Poly [San Luis Obispo] and also a group of USDA officials at the California Strawberry Commission,” said Bolda.

“All of this just underlines the value of these studies to California growers and others working in agriculture,” Bolda said.

Free copies of this study and other sample cost of production studies for many commodities are available. To download the cost studies, visit the UC Davis Department of Agricultural and Resource Economics website at https://coststudies.ucdavis.edu.

This cost and returns study was funded by the UC Davis Department of Agricultural and Resource Economics.

For additional information or an explanation of the calculations used in the studies, contact Jeremy Murdock, UC Davis Department of Agricultural and Resource Economics, at jmmurdock@ucdavis.edu or UC Cooperative Extension’s Bolda at (831) 763-8025.

2022-08-26T08:15:47-07:00August 26th, 2022|

New Orchard Advisor Brings Research Background

By Tim Hearden, Western Farm Press

The central San Joaquin Valley has a new University of California Cooperative Extension orchard crops advisor who once took part in research into the way people pronounce the word “almond.”

Cameron Zuber, a UCCE staff researcher in Merced County since 2016, has been named the orchard crops advisor for Merced and Madera counties.

He will cover a variety of crops in Merced County, including walnuts, almonds and pistachios as well as figs and stone fruit, and will work with walnut growers in Madera County, according to the university.

Among his contributions to UCCE has been to keep alive a project on how Californians pronounce the word “almond” and mapping where they live, color-coding whether they pronounce the “l.”

The website https://ucanr.edu/sites/sayalmond was started by a marketing and social media expert who left the UC’s Division of Agriculture and Natural Resources a few years ago, spokeswoman Pamela Kan-Rice said.

Zuber earned his bachelor’s degree in environmental biology and management from UC Davis and a master’s in environmental systems from UC Merced before joining the university as a researcher.

For orchard crops, he has worked on fumigants and other soil pest controls, rootstocks and scion varietals, cultural practices related to tree spacing and whole orchard recycling, according to the university.

He also has experience in water management, having studied flood irrigation for groundwater recharge, irrigation and soil, water and air interactions.

A growing team

Zuber began his new position June 6, joining a growing team of Extension advisors and specialists as UCANR has received increased funding from Gov. Gavin Newsom and the state Legislature.

He was one of seven new advisors recently announced by the university, with others bringing expertise in wildfire, grapes, small-scale farms and youth development.

Among other advisors working with growers, Joy Hollingsworth began as the new table grape advisor serving Tulare and Kings counties on May 16; Kirsten Pearsons started as small farms advisor in San Luis Obispo and Santa Barbara counties on March 1; and Ricky Satomi joined UCCE Sutter-Yuba on March 15 as an area forestry and natural resources advisor in the Western Sierra Nevada region.

2022-07-28T14:58:19-07:00July 28th, 2022|

Munk, ‘pivotal’ in cotton success, retires after 36 years in Fresno County

By Pam Kan-Rice, UCANR

Daniel Munk, UC Cooperative Extension farm advisor, retired from a 36-year career with UC Agriculture and Natural Resources on July 1. 

“Dan has played a pivotal role in the success of cotton that has been grown in California, especially his work on drought-related growing conditions and how best for cotton to overcome those conditions and thrive,” said Roger Isom, president and CEO of California Cotton Ginner & Growers Association and Western Agricultural Processors Association in Fresno.

“And while I know he has been involved most recently in reduced tillage research, it is his irrigation work that he will be remembered for,” Isom said. “Dan put on numerous irrigation workshops and grower meetings over the years, and he was the cotton industry’s ‘go to guy’ on deficit irrigation and related topics.” 

As a youngster, the Bay Area native was interested in the natural sciences so he earned a B.S. in soil and water science and an M.S. in soil science from UC Davis. 

“I never had an idea of becoming a farm advisor until I worked with Donald Grimes,” Munk said. In 1986, Munk took a job assisting the now UC emeritus water scientist with research on water penetration problems. It was while working with Grimes at Kearney Agricultural Research and Extension Center south of Fresno, Munk said, “I got an understanding of the importance of agriculture.” 

In 1990, he became a UC Cooperative Extension farm advisor in Fresno County.

“Dan has been helpful,” said John Diener, a Five Points farmer who began working with Munk in the 1990s. “If I needed anything, he was helpful, bringing information like for lygus bug or diseases or new varieties.” 

To solve a salinity problem, Diener consulted Munk. “Dan was an irrigation guy and worked with USDA ARS and NRCS. This was bigger than what a local farmer can do,” Diener said, adding that Munk brought UC technical knowledge and resources from USDA Agricultural Research Service and USDA Natural Resources Conservation Service to the West Side of Fresno County to build a tile system for managing the salinity in drainage water. “It took a whole group of people to make it happen,” Diener said.

When Munk joined UC Cooperative Extension, California was growing over 1 million acres of cotton, mostly Acala varieties. During the state’s six years of drought spanning the 1980s and 1990s, growers began planting the higher priced extra-long staple Pima cotton varieties instead of Upland cotton types.

In response, Munk began studying ways to improve irrigation management for Pima cotton. He and colleagues also studied plant growth regulators and found that by treating vigorously growing Pima cotton plants with plant growth regulators following first bloom, cotton yields improved by 60 to 120 pounds per acre, which translated to a $50 to $100 per-acre increase in crop value, with higher cotton quality and fewer problems with defoliation. 

As water became increasingly limited in California, the state’s cotton acreage plummeted and Munk turned his research to producing crops with less water using reduced tillage systems. In one study, he and his research collaborators found that they could improve water use efficiency by 37% by growing cotton in wheat residue versus conventional tillage. In other research, Munk and colleagues showed that reduced till cotton systems could reduce fuel use by more than 70%, increase soil carbon by more than 20%, and reduce dust emissions by more than 60%, relative to conventional till approaches. Another of Munk’s projects suggests that garbanzos and sorghum can be grown under no-till practices in the San Joaquin Valley without loss of yield.

“He has also been helpful in issues related to nitrogen uptake and air and water quality,” Isom said.

Because of Munk’s expertise in nutrient and water management practices, he was asked to serve on the state’s Agricultural Expert Panel in 2014 to assess agricultural nitrate control programs. They developed recommendations for the State Water Resources Control Board to protect groundwater.

One of the recommendations was to develop a comprehensive and sustained educational and outreach program. As a result, the California Department of Food and Agriculture and UC California Institute for Water Resources created the Irrigation and Nitrogen Management Training Program, for which Munk helped develop curriculum and train growers and farm consultants on best farm practices for nitrogen and water management. Leading the program’s southern San Joaquin Valley courses, he helped certify more than 300 growers, consultants and farm advisors in protecting groundwater.

“I hope these more recent programs will have lasting impacts on farm economic viability and improved groundwater quality,” Munk said.

The farm advisor also extended his irrigation knowledge beyond farms. Working with fellow UCCE advisors and specialists, Munk conducted hands-on training for school landscape staff in 2012-2013. The staff learned how to measure irrigation output, sample soil and manage water to avoid runoff and improve water quality. 

“He has had a huge impact, and his work will remain instrumental in the cotton industry’s survival in California as we deal with ongoing drought issues,” Isom said. “His departure will leave an empty spot in the cotton world today without a doubt!”

2022-07-20T11:51:59-07:00July 20th, 2022|

UC ANR Adds More Farm, Fire and Forestry Expertise to More Communities

By Pam Kan-Rice, UCANR

With increased funding from Gov. Gavin Newsom and the state Legislature, University of California Agriculture and Natural Resources is continuing to hire scientists and staff to better serve California communities. The most recent people hired for UC Cooperative Extension bring expertise in wildfire, orchard crops, grapes, small-scale farms and youth development.

Satink Wolfson hired as newest fire advisor

Barb Satink Wolfson began in her role as UC Cooperative Extension fire advisor for Monterey, San Benito, Santa Clara and Santa Cruz counties on June 30.

Her primary responsibilities include wildland fire-related research and outreach for the Central Coast region, while building trust, strong partnerships and collaborative relationships within both professional and non-professional communities.

Satink Wolfson earned her B.S. and M.S. in forestry from Northern Arizona University, and brings to UC ANR more than 20 years of fire-research and outreach experience in Arizona. Her favorite job, though, was working as a backcountry ranger in Yosemite National Park during her undergraduate years.

In her new role, Satink Wolfson hopes to address some of the questions behind the use of prescribed fire in a variety of ecosystems (such as coastal prairies and oak woodlands), and help all Central Coast communities build resilience to wildland fire so residents can live safely within fire-adapted landscapes.

Satink Wolfson, who will be based at the UCCE office in Hollister starting Aug. 1, can be reached at bsatinkwolfson@ucanr.edu.

Zuber named UCCE orchard crops advisor

Cameron Zuber has been named UC Cooperative Extension orchard crops advisor for Merced and Madera counties. For Merced County, he will cover orchard crops such as stone fruit, walnuts and almonds, not including pistachios and figs. For Madera County, he will work with walnuts.

Zuber joined UC Cooperative Extension in 2016 as a staff researcher in Merced County. In his education and professional career, he has worked in understanding environmental and agricultural systems and their interactions with people, society and governance. Specifically with orchard crops, he has worked on fumigants and other soil pest controls, rootstocks and scion varietals, cultural practices relating to tree spacing and whole orchard recycling. He has also studied flood irrigation for groundwater recharge, irrigation and water management and soil, water and air interactions.

He earned his bachelor’s degree in environmental biology and management from UC Davis and a master’s degree in environmental systems from UC Merced.

Zuber is based in the UC Cooperative Extension office located at 2145 Wardrobe Ave, Merced, CA 95348 and can be reached at cazuber@ucanr.edu and (209) 385-7403.

Hollingsworth named UCCE table grape advisor

Joy Hollingsworth began working as the new UCCE table grape advisor serving Tulare and Kings counties on May 16.

Prior to becoming a table grape advisor, Hollingsworth served for three years as the UCCE nutrient management/soil quality advisor for Fresno, Madera, Kings and Tulare counties. In that position she worked on research and extension projects in a variety of agricultural systems, including work on dairy manure, cover crops and biostimulants in raisin grapes.

Previously, Hollingsworth spent six years working as a research associate for the University of California on agronomic cropping systems, including sugar beets, canola and sorghum.
She earned a master’s degree in plant science from California State University, Fresno, and a bachelor’s degree in communication from UC Davis.

Hollingsworth is now based in Tulare and can be reached at (559) 684-3313 or joyhollingsworth@ucanr.edu. Follow her on Twitter @ucce_joy.

Carmignani joins UCCE as fire advisor

Luca Carmignani joined UCCE as a fire advisor for Orange and Los Angeles counties May 2. His research interests include image analysis, computer programming and scientific outreach.
Prior to joining UC ANR, Carmignani was a postdoctoral researcher in the Berkeley Fire Research Lab at UC Berkeley. His research has focused on fire and combustion applications, from wildland fires to material flammability.

He earned his Ph.D. in engineering sciences from the joint doctoral program between UC San Diego and San Diego State University after obtaining his bachelor’s and master’s degrees in aerospace engineering from the University of Pisa in Italy.

Carmignani is based at South Coast Research and Extension Center in Irvine and can be reached at carmignani@ucanr.edu and (949) 237-2956. Follow him on Twitter @l_carmignani.

Pearsons joins UCCE as small farm advisor

Kirsten Pearsons joined UC Cooperative Extension on March 1 as a small farm advisor for San Luis Obispo and Santa Barbara counties. She is developing research and extension programs focused on integrating soil health practices and pest management strategies for small-scale farmers and specialty crops.

Prior to joining UC ANR, Pearsons was a postdoctoral researcher at the nonprofit Rodale Institute in Kutztown, Pennsylvania, where she focused on studying and promoting organic and regenerative agriculture. She worked on Rodale’s long-term Farming Systems Trial, studying how organic and reduced-till field crop production affects long-term farm economics, soil health and water quality compared to conventional practices.

She earned a Ph.D. in entomology at Pennsylvania State University and a B.S. in environmental toxicology at UC Davis.

Pearsons is based in San Luis Obispo and can be reached at kapearsons@ucanr.edu and (805) 788-9486. She will be posting event information and resources for small-scale farms in San Luis Obispo and Santa Barbara counties on Instagram @ucceslosmallfarms.

Satomi moves to UCCE Sutter-Yuba

Ricky Satomi joined UCCE Sutter-Yuba on March 15 as an area forestry and natural resources advisor in the Western Sierra Region (Sutter, Yuba, Butte, Nevada and Placer counties). He specializes in forest management with a focus on new technologies and wood products.

Prior to moving to UCCE Sutter-Yuba, Satomi served as a UCCE area forest advisor working on forestry and youth education issues for Shasta, Trinity and Siskiyou counties.

Satomi earned a Master of Forestry looking at the cost efficiency of forest mastication treatments, and a B.S. in forestry & natural resources and society & environment, both from UC Berkeley. He has also worked as a field forester working on various inventory and timber management programs throughout California.

In the coming year, he hopes to offer workshops for forest landowners and professionals around novel GIS tools, climate-smart silvicultural practices, reforestation best practices, and workforce development opportunities.

Satomi is based in Yuba City and can be reached at (530) 822-6213 or rpsatomi@ucanr.edu.

Armstrong joins 4-H in Tuolumne County

Erika Armstrong has joined the UCCE Central Sierra team as 4-H Youth Development Program representative for Tuolumne County.

Armstrong, who has spent her career working with nonprofit agencies and managing volunteer programs, worked with United Way Monterey County and the Alliance on Aging. She also was a campaign manager for a candidate for the Board of Supervisors of Monterey County. Her most recent job was stay-at-home mother for her daughters.

She holds a bachelor’s degree in collaborative health and human communication from California State University Monterey Bay.

Armstrong is based at the Tuolumne office and can be reached at (209) 533-6990 and elarmstrong@ucanr.edu.

2022-07-14T09:12:55-07:00July 14th, 2022|

Organic Farmers to get Technical Assistance From CDFA and UC ANR

By Pam Kan-Rice, UCANR

The California Department of Food and Agriculture is awarding $1.85 million to the University of California Agriculture and Natural Resources to increase technical assistance for California’s organic farmers.

CDFA’s State Organic Program is executing $850,000 in contracts with UC ANR to run through September 2024, while CDFA’s Office of Environmental Farming and Innovation is awarding a $1 million grant to run from July 2022 to June 2025.

“California farmers provide 36% of all organic production in the United States,” said CDFA Secretary Karen Ross. “This funding expands technical assistance to growers transitioning to certified organic agriculture and supports our strong California community of organic farmers and consumers by conducting field trials and demonstration projects with farmers to improve organic practices.”

California organically farms just over 2 million acres, which is about 8% of the total agricultural acreage in the state, and will likely continue to expand over time as long as consumer demand continues to rise, according to Houston Wilson, director of UC ANR’s Organic Agriculture Institute.

“Demand for organic agriculture has consistently grown every year for the past two decades,” Wilson said. “Organic currently accounts for 5.8% of domestic food sales.”

“We are excited to see CDFA increasing support for organic agriculture as part of a broader climate-smart agriculture strategy,” said Wilson. “As demand for organic continues to rise, California growers need increasingly targeted technical assistance in all areas of organic production and marketing.”

The CDFA funds will allow UC ANR to hire two academic coordinators, which are currently being recruited.

“The academic coordinators will work directly with growers, as well as develop research and extension projects that will involve existing UC Cooperative Extension personnel,” Wilson said. “One of the coordinators will specifically focus on connecting our efforts with small-scale and historically underserved growers through our partnership with the UC Small Farms Program.”

The organic practices can be used by conventional farms as well as organic farms.

“Just as organic farmers benefit from UC ANR’s pest management, irrigation and crop production research, the new knowledge developed on organic practices by the UC Organic Agriculture Institute will be useful for all California farmers,” said Glenda Humiston, UC vice president for agriculture and natural resources.

Some of the key UC ANR project objectives include:

  • Conduct research on soil health management, carbon sequestration and crop rotations in organic systems
  • Create new extension and training opportunities for organic growers across California
  • Provide technical assistance to both certified and transitioning organic growers
  • Review and summarize organic acreage and practices in California
  • Develop economic analysis of organic production and markets

The 2022-2023 state budget signed last week by Gov. Gavin Newsom includes $5 million in funds for CDFA to assist farmers with transitioning to organic operations, and the USDA recently announced an investment of up to $300 million for the same purpose.

2022-07-08T10:24:12-07:00July 8th, 2022|

Advances in Pistachio Water Management Workshop July 7

Join UC Nut Crops Advisor Catherine Mae Culumber, Irrigation Specialists Daniele Zaccaria and Khaled Bali, Irrigation Advisor Blake Sanden, Professional Researcher Elia Scudiero, and other University of California experts in this in-person Water Management Workshop on July 7, 2022 at the International Agri-Center in Tulare, CA to learn about the latest research and advances in Pistachio Water Management and Irrigation. CEU credits for Soil & Water Management have been approved for this workshop. 

This workshop will be held at the International Agri-Center in Tulare, CA on July 7, 2022.

Registration includes participation fee, coffee breaks, lunch, and access to workshop presentations.

Topics Include: Pistachio soil-plant-water relations, stress physiology, evapotranspiration and crop coefficients, soil-water budgeting, soil characterization and salinity mapping, tree water status, irrigation scheduling, and strategies for Pistachio irrigation management under limited and impaired water supplies. A set of irrigation-related methods, technologies, and products to help growers schedule and manage irrigation will also be presented during the Workshop. 

Who Should Attend: Pistachio growers and farm managers, representatives from the pistachio production industry, irrigation consultants and practitioners, CCAs, CPAs, water resource managers, water conservation districts’ personnel, irrigation districts’ managers, extension specialists and advisors, professional researchers, university students, and representatives from state agencies. 

To register, click here.

2022-06-22T09:55:46-07:00June 22nd, 2022|

Pest Variability Poorly Understood

UC Davis Ecologist Daniel Paredes: Understanding Pest Variability Key to Managing Pest Outbreaks

Newly published research led by UC Davis ecologist Daniel Paredes suggests that pest abundances are less variable in diverse landscapes comprised of multiple crop types and patches of natural habitat.

“As a result, pest outbreaks are less likely in diverse landscapes,” said Paredes, who analyzed a 13-year government database of diversified landscapes encompassing more than 1300 olive groves and vineyards in Spain. The database documented pests and pesticide applications.

The paper, “The Causes and Consequences of Pest Population Variability in Agricultural Landscapes,” appears in the Ecological Society of America journal, Ecological Applications. Co-authors are UC Davis distinguished professor Jay Rosenheim of the Department of Entomology and Nematology, and Daniel Karp, associate professor, Department of Wildlife, Fish, and Conservation Biology.  The research is online at https://bit.ly/3a64WRN.

Pest variability: an understudied but critical topic
Although population variability is often studied in natural systems, the need for long-term pest population data collected across many farms has largely prevented researchers from studying pest variability in agricultural systems, said Paredes, a postdoctoral fellow in the Karp lab.

“However, understanding variability in agriculture is key to understanding when pest outbreaks are likely to occur,” Paredes said. “Farmers are really risk averse, with fear of very rare but severe pest outbreaks driving their decisions.  But huge datasets are needed to understand when outbreaks are likely to occur and better inform management.”

“We found that more variable pest populations are more likely to downgrade crop quality and induce catastrophic damages,” Paredes said. “For example, the likelihood that olive flies consume more than 20 percent of olive crops doubled when comparing the most versus the least volatile populations.”

What causes a pest population to be variable?
Having shown that more pest-population variability is more likely to cause problems for farmers, the researchers then set out to discover what farmers could do to manage variability.

One key factor that emerged was the type of landscape the crops were grown in, specifically whether the landscape was dominated by vast fields of a single crop variety or more diversified. Pest populations were both more abundant and more variable in crop monocultures.

However, while landscape type influenced both pest population sizes and variability, this was not always the case for other variables. “This research shows that the factors that promote high overall mean pest density are not necessarily the same factors that promote high variability in pest density,” Rosenheim said. “So, mean densities, which is what researchers have been studying for decades and decades, are only part of the story.  Variation in density, and in particular unpredictable severe outbreaks, need to be studied separately.”

The take-away message?

“In Spain, planting multiple crops and retaining natural habitats would help stably suppress pests and prevent outbreaks,” said Paredes, a native of Spain who holds a doctorate in environmental sciences (2014) from the University of Granada. “Diversifying agricultural may be a win–win situation for conservation and farmers alike.”

“Therefore, we encourage agricultural stakeholders to increase the complexity of the landscapes surrounding their farms through conserving/restoring natural habitat and/or diversifying crops,” the researchers wrote in their abstract.

Tapping into other large datasets such as this one, will be key to understanding whether diversified landscapes also help mitigate pest variability and outbreaks in other areas, they said.

This project was funded by the National Science Foundation with funds from the Belmont Forum via the European Biodiversity Partnership: BiodivERsA. It was also supported by the USDA National Institute of Food and Agriculture.

2022-05-19T13:47:29-07:00May 19th, 2022|

Community Members Invited to Support Favorite UC ANR Programs May 19-20

By Pam Kan-Rice, UCANR

California farmers can grow crops with less water. Gardeners can control pests with safer methods. Community members can take steps to protect their homes from wildfire. Children can learn life and work skills. Families can stretch their food dollars to provide nutritious meals. Californians have benefited from University of California Agriculture and Natural Resources research and outreach in many ways. And thanks to the state’s historic boost to UC ANR funding, more UC Cooperative Extension scientists and educators are being hired to address the unique needs of communities across California.

From noon to noon on May 19-20, the public is invited to donate for UC ANR Giving Day, sponsored by Tri Counties Bank, to enhance their favorite UC ANR projects or programs. 

The 24 hours of giving will expand UC ANR outreach to benefit the health and well-being of more Californians throughout the state.

In the past, donations have been used to fund UC Master Gardener demonstration gardens, purchase teaching supplies for California Naturalists, and fund scholarships for children to develop life and work skills in UC ANR’s 4-H programs.

Donors are invited to give to UC Cooperative Extension in their counties, Research and Extension Centers and favorite programs. When visitors click “GIVE” on the upper right of the website http://donate.ucanr.edu/givingday, fund choices appear in drop-down menus. 

Online gifts made between noon on May 19 and 11:59 a.m. on May 20 may help programs qualify for prize challenge awards. Donations can be made at http://donate.ucanr.edu/givingday.

If you prefer sending a check instead of donating online, please make checks payable to “UC Regents” and specify the fund, then mail to UC ANR Gift Processing, 2801 Second Street, Davis, CA 95618.

UC Agriculture and Natural Resources brings the power of UC to all 58 California counties. Through research and Cooperative Extension in agriculture, natural resources, nutrition, economic and youth development, our mission is to improve the lives of all Californians. Learn more at ucanr.edu and support our work at donate.ucanr.edu.

2022-05-17T12:07:18-07:00May 17th, 2022|

Water Measurement and Reporting Courses Offered by UCCE May 26

By Pam Kan-Rice, UCANR

California water-rights holders are required by state law to measure and report the water they divert from surface streams. For people who wish to take the water measurements themselves, the University of California Cooperative Extension is offering a virtual training to receive certification on May 26.

At the workshop, participants can expect to

  • clarify reporting requirements for ranches.
  • understand what meters are appropriate for different situations.
  • learn how to determine measurement equipment accuracy.
  • develop an understanding of measurement weirs.
  • learn how to calculate and report volume from flow data.

“We are limiting the number participants for the water measurement training to 30 people per session,” said Larry Forero, UC Cooperative Extension livestock and natural resources advisor. “If you need this training, please register soon.”

The scheduled trainings will be held Thursday, May 26, at two locations:

  • Redding at Shasta College Farm.  Registration is required and costs $25. To register visit https://ceshasta.ucanr.edu. For more information, contact Larry Forero (lcforero@ucanr.edu) or Sara Jaimes (sbjaimes@ucanr.edu) or by calling the UCCE office in Shasta County at (530) 224-4900. Training will begin at 8 a.m. and conclude at 11:30 am.
  • Woodland at the UC Cooperative Extension at 70 Cottonwood Street. Registration costs $20. To register, visit https://cecapitolcorridor.ucanr.edu. For more information, contact Morgan Doran at mpdoran@ucanr.edu or the UCCE Yolo County office at (530) 666-8143. Training will begin at 2:30 p.m. and conclude at 5:30 pm.

Background:

Senate Bill 88 requires all water right holders who have previously diverted or intend to divert more than 10 acre-feet per year (riparian and pre-1914 claims), or who are authorized to divert more than 10 acre-feet per year under a permit, license or registration, to measure and report the water they divert. Detailed information on the regulatory requirements for measurement and reporting is available on the State Water Resources Control Board Reporting and Measurement Regulation webpage. The legislation requires that installation and certification of measurement methods for diversion (or storage) greater than or equal to 100-acre feet annually be approved by an engineer/contractor/professional.

California Cattlemen’s Association worked with Assemblyman Frank Bigelow on a bill that allows a self-certification option. Assembly Bill 589 became law on January 1, 2018. This bill, until Jan. 1, 2023, allows any diverter who has completed this instructional course on measurement devices and methods administered by the University of California Cooperative Extension, and passes a proficiency test, to be considered a qualified individual when installing and maintaining devices or implementing methods of measurement.

UC Agriculture and Natural Resources brings the power of UC to all 58 California counties. Through research and Cooperative Extension in agriculture, natural resources, nutrition, economic and youth development, our mission is to improve the lives of all Californians. Learn more at ucanr.edu and support our work at donate.ucanr.edu.

2022-04-27T13:22:26-07:00April 27th, 2022|
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