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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

You Can Take That to the Bank!

Sunflower bees, Svastra obliqua expurgata, flying to a nesting area in downtown Davis, Calif. (Photo by Kathy Keatley Garvey)

They're good bees. You can take that to the bank! The excitement began when Martin Guerena, an integrated pest management (IPM) specialist with the City of Davis, encountered a native bee nesting site Wednesday in front of the U.S. Bank, corner of 3rd...

Posted on Thursday, July 2, 2015 at 6:08 PM

Keep Your 'Girls' Out of California Buckeye

A bee forages on California buckeye in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

Beekeepers don't like their "girls" foraging in California buckeye (Aesculus californica) It's poisonous to bees. "The signs of poisoning can be as severe as dying adult bees and brood, only dying brood, brood that barely makes it and emerges...

Posted on Wednesday, July 1, 2015 at 6:02 PM
Tags: California buckeye (6), Eric Mussen (197), honey bees (238)

The Butterfly and the Stink Bug

Papilio rutulus, lands on a butterfly bush. Note the stink bug on top. (Photo by Kathy Keatley Garvey)

It's sort of like "The Beauty and the Beast." Or "The Pollinator and the Pest." A gorgeous Western Tiger swallowtail (Papilio rutulus), seeking nectar from a butterfly bush, touched down and began to feed. It didn't take long for the butterfly to...

Posted on Tuesday, June 30, 2015 at 6:34 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


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UC Blogs

The strawberry aphid is one of the pests included in the new app. New app helps strawberry growers manage pests
Posted 6/16/2015 - IPMinfo, the first app from UC Agriculture and Natural Resources (UC ANR) that provides integrated pest management (IPM) information to farmers, is now available for free download for iPhones on the App Store. The current...

Lettuce field near Salinas, CA The public is invited to the California Nitrogen Assessment’s Stakeholder Review Process
Posted 6/10/2015 - California farmers are seeing new nitrogen monitoring requirements they must implement in the years ahead. The state of California continues discussion on how growers can improve nitrogen use efficiency and how California can best respond to increasing...

Trees killed by bark beetles on the Stanislaus National Forest in 1992. (Photo: Jack Kelly Clark) Forest and tree health in a time of drought
Posted 6/8/2015 - The fourth winter in a row of disappointing precipitation has triggered a die off of trees in the Sierra Nevada, most of which is now in ‘exceptional drought' status. The US Forest Service conducted aerial monitoring surveys by airplane in April...

The author, Hannah Bird, and a third-grader unroll a tape measure to show how long woodpeckers' tongues are in relation to their beaks. Here are your clues: A helmet, a feather duster and a tape measure…
Posted 6/3/2015 - It's hard to keep up with all the changes in K-12 education standards. We hear about the evolution of Common Core and Next Generation Science standards as well as curriculum offered through the Environmental Education Initiative. All programs stress the...

Dairy cattle breeding can be improved with genomics. Science will allow dairies to pick from a smorgasbord of genes for cow breeding
Posted 6/1/2015 - Conventional breeding of cattle over decades has resulted in significant positive impacts for dairies and the environment. With genomics, the future looks still brighter. For the most part, dairy operators select cattle for breeding that have the...

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