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's one of the most beautiful, incredible images of a leafcutter bee we've ever seen. Talented macro insect photographer Donna Sanders of Emerald, Queensland, Australia, captured this spectacular photo (below) of a female leafcutter bee carrying a leaf...
The Häagen-Dazs Honey Bee Haven is the place to "bee" on Saturday, March 30 for youngsters who want to learn more about honey bees and native bees. The bee haven, operated and maintained by the UC Davis Department of Entomology and Nematology, is...
In between the rains today, we saw them. So beautiful! Painted ladies, Vanessa cardui, nectaring in patches of colorful wildflowers in the Biological Orchard and Gardens (BOG), located behind the Mann Laboratory on University of...
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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
CalLands maps cropland ownership across California
Two UCANR Cooperative Extension specialists have recently launched CalLands, a powerful online tool that can help users understand how land ownership impacts California's croplands. To build the CalLands' interactive website, Luke Macaulay and Van...
UCCE research seeks biological solutions for the agriculture industry
UC Cooperative Extension plays an active and ongoing role in the effort to increase agricultural sustainability and minimize the industry's environmental impact, a role that was showcased at the third Ag Innovations Conference in March. Held in Santa...
UC researchers discover how grapevine red blotch virus diminishes winegrape value
Grapevine red blotch virus, a disease that is dramatically reducing the value of winegrapes in California's premium wine production region, is harming plants by inhibiting photosynthesis in the leaves, according to research published this month in the...
New project to build climate resilience through improved land management
A $4.6 million grant to UC Merced and UC Irvine will help UC Agriculture and Natural Resources researchers develop new tools and methods for California land owners to better manage the state's forests, shrub lands and grasslands. California's...
Researcher invites public to visit San Joaquin Valley soil health demonstration site in Five Points
UC Cooperative Extension cropping systems specialist Jeff Mitchell is issuing a standing invitation to the public to visit the site of an ongoing conservation agriculture research project and see for themselves the results of long-term soil-building...