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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

Myths and Gifts

Robbin Thorp with two of the books he co-authored. (Photo by Kathy Keatley Garvey)

Myths and gifts... When the UC Davis Bohart Museum of Entomology hosts its open house from 1 to 4 p.m., Sunday, Nov. 23, the theme will be "Insect Myths." (Okay, and spider myths, too!) You'll learn about honey bee, ladybug, butterfly and spider...

Posted on Friday, November 21, 2014 at 5:40 PM

For the Love of Bats

Rachael Long beneath the Yolo Causeway with a bat detector. Notice the bats in the photo.  (Photo courtesy of the California Farm Bureau Federation)

Most of us think about bats at least twice a year: during National Pollinator Week, when bees, beetles, butterflies and bats beckon, and on Halloween, when bats mingle with the witches, ghosts, ghouls, goblins and other things that go bump in the...

Posted on Thursday, November 20, 2014 at 9:30 PM

Remembering the Wild Bees

Native bee enthusiast Celeste Ets-Hokin of the Bay Area is on a mission: she wants residents to provide habitat for wild bees, including bumble bees, sweat bees, miner bees, mason bees, digger bees and long-horned bees. Earlier this year she came out...

Posted on Wednesday, November 19, 2014 at 9:29 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

Studies suggest biofuel can be grown on 'marginal land,' but no standard definition of 'marginal land' exists. The food vs. fuel debate: Growing biofuel in the U.S.
Posted 11/21/2014 - In order to slow global climate change and achieve greater energy independence, Americans are showing an increasing interest in switching over to clean, renewable fuels made from home-grown crops. In fact, Congress has mandated that at least 16 billion...

Argentine ants tending brown soft scale on a citrus twig. Chlorpyrifos is sometimes necessary to control ants in citrus. UC scientists help clarify use of insecticide
Posted 11/17/2014 - The insecticide chlorpyrifos is a critically important tool for California producers of alfalfa, almonds, citrus and cotton, according to a comprehensive report coordinated by the UC Statewide Integrated Pest Management Program. As part of an action...

Nutrient management in almond orchards will be discussed in November. Drought-focused soil nutrient management series offered for farmers online
Posted 11/7/2014 - Beginning in November, a free, drought-focused soil nutrient management series for farmers will be hosted online by the University of California Sustainable Agriculture Research & Education Program (UC SAREP), FarmsReach and Sustainable...

California Naturalist Scott Van Tyle takes a close look at a sea kelp rootball on the beach at Asilomar. The California Naturalist program hits its stride
Posted 10/30/2014 - Under sunny skies, a cool breeze blowing off the ocean at Asilomar State Beach, California Naturalist Scott Van Tyle pulls out a knife and begins dissecting a seaweed root ball that had washed up on the sand. A group of fellow naturalists quickly gather...

It's easy to confuse light brown apple moth caterpillars (above) with look-alikes, including orange tortrix, omnivorous leafroller, avocado leafroller and apple pandemic moth. Is that a light brown apple moth?
Posted 10/28/2014 - Nursery workers are the first line of defense in detecting light brown apple moth when growing ornamental plants in commercial nurseries. A new brochure and video can help those in the field distinguish light brown apple moth from several look-alike...

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