Cooperative Extension San Joaquin County
University of California
Cooperative Extension San Joaquin County

UC Cooperative Extension

ACP (Asian citrus psyllid) found in San Joaquin county

The ACP (Asian citrus psyllid) was found in Lodi and Manteca.  Click here to find out how you can help prevent the spread of this unwanted pest and what to do if you think you have it.

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.

UC Blogs

The Most Incredible Image of a Leafcutter Bee

An amazing image of a leafcutter bee carrying a leaf segment back to her nest. This image, used with permission, is by Donna Sanders of Emerald, Queensland, Australia.

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...

Posted on Friday, March 22, 2019 at 4:45 PM
Focus Area Tags: Environment,Innovation,Yard & Garden

Haven Is the Place to 'Bee' for Junior Gardeners on March 30

Gardening tools for youngsters at the UC Davis Häagen-Dazs Honey Bee Haven, located on Bee Biology Road, west of the central campus. A Junior Bee Gardeners' Day is set from 9 a.m. to 10:30 a.m. on Saturday, March 30. (Photo by Kathy Keatley Garvey)

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...

Posted on Thursday, March 21, 2019 at 4:31 PM
Focus Area Tags: Agriculture,Environment,Innovation,Natural Resources,Yard & Garden

Painted Ladies: What a Delight to See!

A painted lady, Vanessa cardui, nectars on five-spot, Nemophilia maculate, Wednesday afternoon, in the Biological Orchard and Gardens (BOG), UC Davis campus. (Photo by Kathy Keatley Garvey)

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...

Posted on Wednesday, March 20, 2019 at 5:20 PM
Focus Area Tags: Agriculture,Environment,Innovation,Natural Resources

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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

Ag Center May 2008


Event Name

UC Blogs

A crop of California almonds, grown on a plot of land that was previously home to grassland. Photo: Luke Macaulay 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 entomology and biologicals advisor Surendra Dara, shown at a display at the World Ag Expo, was the organizer of the March Ag Innovations Conference in Santa Maria. 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...

A grapevine with red blotch symptoms. (Photo: Evett Kilmartin) 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...

ANR is partnering with UC Merced and UC Irvine scientists to develop new tools and methods for better land management. 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...

UCCE cropping systems advisor Jeff Mitchell with a shovelful of healthy soil at the UC West Side Research and Extension Center. 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...

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