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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

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

The Wild Ones! Want to See Them in a Documentary?

A male Valley carpenter bee, Xylocopa varipuncta. (Photo by Kathy Keatley Garvey)

You've probably seen some of them in your garden, but have you seen them up close? Really close? Have you seen the male Valley carpenter bee, that green-eyed blond fondly nicknamed "the teddy bear bee?" (Well, it does have that fuzzy-wuzzy look, and it...

Posted on Monday, March 2, 2015 at 5:19 PM

The UC Apiary Newsletter Is Smokin'

Extension apiculturist Elina Niño in front of hives at the Harry H. Laidlaw Jr. Honey Bee Research Facility. (Photo by Kathy Keatley Garvey)

If you're looking for the newsletter, from the UC apiaries, it has a new home. The new UC California Cooperative Extension apiculturist, Elina Lastro Niño, has moved it to her website now that Eric Mussen has retired. Mussen, now Extension...

Posted on Friday, February 27, 2015 at 5:20 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

The California black rail is heard but rarely seen. California black rail likes leaks
Posted 3/3/2015 - World Wildlife Day is today, March 3. 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...

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...

A researcher counts honeybees in a blooming onion field. Insecticide use threatens onion seed production
Posted 2/24/2015 - Insecticides farmers use in Northern California onion seed production appear to repel honeybees, which can result in reduced seed yields, according to a recent study by UC Agriculture and Natural Resources (UC ANR) researchers. Visitation by honeybees...

Blue oak trees regenerate after thinning. Thinning is an effective tool for management of blue oak woodlands
Posted 2/20/2015 - Stately oak trees with blue-green leaves – known as blue oaks – are found in the foothills of California's Sierra Nevada and coast range, and nowhere else on earth. They are valued for their beauty, wildlife habitat, shade and acorn...

No-till cover crop seeding into cotton and tomato residues. Conservation ag may allow farmers to be part of carbon ‘cap and trade’
Posted 2/17/2015 - Long-term research by UC Agriculture and Natural Resources scientists has documented the capacity for farmland in the San Joaquin Valley managed with conservation practices to sequester carbon, results that could give farmers a seat at the carbon trading...

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