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.
The world's most dangerous animal isn't the shark, wolf, lion, elephant, hippo, crocodile, tsetse fly, tapeworm, assassin bug (kissing bug), freshwater snail, dog, snake or human. No, it's the mosquito. Infected mosquitoes transmit diseases that ...
Have you seen me? Can you identify me? No, you're a skipper, but which one are you? The colorful brown skipper butterfly that touched down on our Jupiter's Beard in Vacaville, Calif., on May 17 puzzled us. First skipper we've seen this year in...
Yes, bears raid honey bee colonies. But it's primarily for the bee brood, not the honey. The brood provides the protein, and the honey, the carbohydrates. For beekeepers and commercial queen bee breeders, this can wreak havoc. Financial...
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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
Graduate Students in Extension study key California concerns
Posted 5/23/2017 - In 2013, a group of graduate students in the Department of Environmental Science, Policy, and Management (ESPM) at the University of California, Berkeley sought out faculty support and successfully collaborated with UC Agriculture and Natural...
Enjoy nature, but don't love it to death
Posted 5/18/2017 - Spring is here and that means time to get outside and enjoy California's beauty. This year people are out in record numbers to see wildflowers and experience all the recreational opportunities that parks offer. CNN reported triple the usual number of...
Visit a UC Master Gardener demonstration garden, learn and be inspired
Posted 5/4/2017 - Birds are chirping, the sun is shining and flowers are in bloom – it is time to get out into a garden and enjoy nature's beauty. UC Master Gardeners have been working hard to bring demonstration and community gardens to life across California, and...
Free forestry workshops to help teachers meet new science standards
Posted 4/18/2017 - California's K-12 teachers are being challenged by the Next Generation Science Standards to find new and more engaging ways to teach science. Adopted by California in 2013, the science-education standards guide how science, technology, engineering and...
New era of western wildfire demands new ways of protecting people, ecosystems
Posted 4/17/2017 - Current wildfire policy can't adequately protect people, homes and ecosystems from the longer, hotter fire seasons climate change is causing, according to a new paper led by the University of Colorado Boulder. Efforts to extinguish every blaze and...