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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

Of Medflies and Light Brown Apple Moths

UC Davis Distinguished Professor James R. Carey with some of the maps he used in his research. (Photo by Kathy Keatley Garvey)

Congratulations to James R. Carey, distinguished professor of entomology at the UC Davis Department of Entomology and Nematology for his public service award! He has just been named a recipient of a Distinguished Scholarly Public Service Award from the...

Posted on Thursday, March 5, 2015 at 5:15 PM

Come for the Flowers, Stay for the Bugs

A honey bee foraging on a redbud, Cercis canadensis, at the UC Davis Arboretum Teaching Nursery. (Photo by Kathy Keatley Garvey)

If you're going to the UC Davis Arboretum Member Appreciation Plant Sale, set Saturday, March 7 from 9 a.m. to 1 p.m. in the Arboretum Teaching Nursery on Garrod Drive, you'll be in plant heaven. You'll see drought-tolerant plants, plants perfect for...

Posted on Wednesday, March 4, 2015 at 5:53 PM

The Silence of the Cicadas


If you've ever been around cicadas, you know how loud they can be. How loud are they? They are so loud--up to 120 decibels--that many tender-eared folks would like to cite them for "disturbing the peace." All the more reason to appreciate what Christian...

Posted on Tuesday, March 3, 2015 at 6:14 PM

Make a Gift Online

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

An electric mulching mower, which cuts grass clippings into fine pieces and leaves them on the lawn. (Photo: Cheryl Reynolds) Grasscycling can help Californians conserve water
Posted 3/5/2015 - Gov. Jerry Brown asked Californians to cut water use by 20 percent a year ago. Officials at the State Water Resources Board announced in March that water users haven't come close to meeting the conservation goal. To help homeowners save water while...

Elina Lastro Niño working a hive. (Photo courtesy of Elina Lastro Niño) California: A good place to bee
Posted 3/4/2015 - “Honey bees are good teachers and we can all learn from them,” says Elina Lastro Niño, the new Cooperative Extension apiculturist for UC Agriculture and Natural Resources. “Each hive has its own personality and own...

Mike De Lasaux shows FIT participants the tree rings in a core sample. Teachers invited to learn about natural resources in the forest
Posted 3/4/2015 - California teachers are invited to spend a week in a northern California forest this summer and participate in the Forestry Institute for Teachers. “The goal of the Forestry Institute for Teachers, or FIT, is to provide K-12 teachers with...

The California black rail is heard but rarely seen. California black rail likes leaks
Posted 3/3/2015 - While Californians are tightening their pipes to conserve water during this fourth year of drought, the California black rail might say, “Let it leak,” if it could speak. The rare bird species makes its home in marshes created in large part...

Virginia creeper leafhopper adults have a reddish-brown zigzag marking on each front wing. Organic farmers are counting on UC to control exotic Virginia creeper leafhoppers
Posted 2/25/2015 - When Virginia creeper leafhopper made its way into Mendocino and Lake county wine country a few years ago, some certified organic winegrape producers threw in the towel. “They lost too much income,” said Glenn McGourty, a UC Agriculture and...

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