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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

A Bee on a Blanket

A honey bee heading for the blanket flower, Gaillardia. (Photo by Kathy Keatley Garvey)

The first day of May calls for a little color. And the blanket flower (Gaillardia) fills the bill. Native to North and South America, it's a member of the sunflower family, Asteraceae. Its delightful yellow and red flowers remind us of the Native...

Posted on Friday, May 1, 2015 at 5:38 PM

African Odyssey: From a Fog-Harvesting Beetle to a Thundering Elephant

A Racing Stripe Darkling Beetle at Epupa Falls, Namibia. (Photo by Hans Hillewaert, Courtesy of Wikipedia)

Entomologists don't always study insects. If you're James R. Carey , distinguished professor of entomology at UC Davis, and you're in Africa, you also video them--insects like fog-harvesting Namib Desert beetle.  The Namibian Beetle (Stenocara...

Posted on Thursday, April 30, 2015 at 8:58 PM

The Days of Bees and Roses

A honey bee foraging on a yellow rose purchased at the 2014 UC Davis Rose Days. (Photo by Kathy Keatley Garvey)

This weekend will be somewhat like "The Days of Bees and Roses." On Saturday and Sunday, May 2-3, the California Center for Urban Horticulture (CCHU) and the Foundation Plant Services, two entities within the UC Davis College of Agricultural and...

Posted on Wednesday, April 29, 2015 at 8:34 PM

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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

UC Blogs

Rubicon River, El Dorado National Forest King Fire provides learning opportunities
Posted 4/29/2015 - Over a dozen UC Agriculture and Natural Resources (UC ANR) California Naturalists, fire ecology experts, wildlife biologists, resource managers, educators, and artists met at UC Berkeley's Blodgett Forest Research Station and the adjacent El Dorado...

Mulch conserves water around the base of a tree. Help an oak tree tolerate severe drought
Posted 4/24/2015 - National Arbor Day is April 24. With California's continuing drought, many trees are showing signs of water stress. UC Agriculture and Natural Resources tree experts have been hearing from homeowners who are concerned about the effects of the drought on...

An olive orchard in Italy suffering from quick decline syndrome. (Photo: Rodrigo Krugner) New olive disease in Italy concerns California researchers
Posted 4/22/2015 - Olive farmers in southern Italy are dealing with a serious outbreak of olive quick decline syndrome, a new disease with symptoms that include leaf scorching, twig and branch dieback and, ultimately, tree death. In October 2013, the plant pathogen Xyllela...

Isao Fujimoto and his daughter, Esumi. Fujimoto to receive Bradford–Rominger Agricultural Sustainability Leadership Award
Posted 4/21/2015 - Isao Fujimoto, lecturer emeritus of Community Development and Asian American Studies at UC Davis, has been named the 2014 recipient of the Eric Bradford and Charlie Rominger Agricultural Sustainability Leadership Award for his commitment to California...

Area IPM advisor Emily Symmes teaches how to monitor for webspinning spider mites. New videos from UC IPM help stone fruit growers and PCAs tackle pest problems
Posted 4/21/2015 - Spider mites, fruit moth and twig borer larvae, aphids, and bark cankers are just a few pests that can wreak havoc on stone fruit trees. With spring well underway and trees in full bloom and beginning to develop fruit, it's time to monitor and take...

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