UC Cooperative Extension
ACP (Asian citrus psyllid) found in San Joaquin county
Who We Are
Across California, the University of California’s 64 Cooperative Extension offices are local problem-solving centers. We are the bridge between local issues and the power of UC research. Our county-based staff is part of the community – we live and work in the areas we serve.
More than 300 campus-based specialists and county-based farm, home and youth advisors work as teams to bring practical, unbiased, science-based answers to problems across California.
As part of the agricultural community, we help farmers develop more-efficient growing methods, solve pest management problems and develop crops and irrigation methods that use less water.
As stewards of the land, we help develop smart water-use strategies, develop wildfire education and help preserve natural areas and farmland.
As advocates for healthy communities, we promote healthy diets and exercise for better health, help Californians learn to choose the most nutritious foods and help shape the citizens of tomorrow through the 4-H Youth Development Program.
And thousands of volunteers extend the reach of our work through the Master Gardener Program and the California 4-H Youth Development Program.
We work in full partnership with federal, state, county and private resources.
We are stewards, problem-solvers, catalysts, collaborators and educators.
We are UC Cooperative Extension.
It was so well-deserved. Internationally known honey bee guru Eric Mussen, Extension apiculturist emeritus, drew a rousing, standing ovation on Jan. 12 at the 75th annual American Beekeeping Federation's conference in Reno. To his surprise, Mussen...
If you've been looking for that cabbage white butterfly in the three-area county of Sacramento, Yolo and Solano to win UC Davis Professor Art Shapiro's "Beer for a Butterfly" contest, there's still hope. Shapiro hasn't found it, either. Butterflies...
Butterfly heaven! Entomologist Jeff Smith, who curates the butterfly and moth collection at the Bohart Museum of Entomology, UC Davis, is in butterfly heaven. And even more so now--he just returned from a collecting trip to Belize with his colleagues...
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Brent A Holtz Ph.D.
San Joaquin County Cooperative Extension
Robert J. Cabral Ag Center
2101 E. Earhart Avenue, Ste 200, Stockton, CA 95206
Phone: (209) 953-6100
Fax: (209) 953-6128
Click here for a map
Flooding alfalfa fields has high potential for groundwater recharge
Posted 1/19/2018 - A rigorous field study in two California climate zones has found that alfalfa can tolerate very heavy winter flooding for groundwater recharge. The research was published online Jan. 16 in California Agriculture journal. The alfalfa research is the...
Ag leaders, scientists set priorities to prevent invasive pest threats to the environment and economy
Posted 1/18/2018 - The gypsy moth, an interloper from Europe and Asia, is threatening California's majestic oaks in Ventura County. Invasive desert knapweed, which comes from Africa, has made its first North American appearance in in California's Anza-Borrego Desert,...
Dig it, Grow it, Eat it: School gardens support learning and healthier food choices
Posted 1/17/2018 - The success of a garden is normally identified by plentiful crops of tomatoes and squash or the beautiful display of vibrant thriving flowers, shrubs or trees. However, a school garden's true success is dependent on the rich experiences and...
Newly minted UC fire scientist Kate Wilkin moves into fire country
Posted 1/16/2018 - Fire scientist Kate Wilkin was on the job just a few weeks when ferocious winds whipped up the Northern California firestorm of 2017. The national media focused on Napa and Sonoma counties, where the deadly Tubbs fire became the most destructive...
UCCE works with CDFA to help Hmong farmers conserve water and reduce emissions
Posted 1/11/2018 - California farmers Fong Tchieng and Vang C. Thao have a lot in common. They both have farming operations in the Central Valley. They both belong to the state's vibrant – and growing – Hmong farming community. And most importantly, they have...