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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

Two Who Make a Difference

Emcee Bill Rains (left) congratulations Robbin Thorp. (Photo by Kathy Keatley Garvey)

They are two who make a difference. Native pollinator specialist Robbin Thorp, emeritus professor of entomology, received the 2015 Distinguished Emeritus Award and Hugh Dingle, emeritus professor of entomology, received an Edward A. Dickson Emeritus...

Posted on Wednesday, February 25, 2015 at 9:14 PM

How Are These Two Alike?

A honey bee gathering nectar from a bush germander at CornerStone Sonoma. (Photo by Kathy Keatley Garvey)

What does a bee have in common with a bulldog? If you've ever been to Cornerstone Sonoma on Arnold Drive (Highway 121) in Sonoma, and admired the luxurious gardens and intriguing shops, you know. The bees go head-first in the blossoms and Axel, an...

Posted on Tuesday, February 24, 2015 at 5:59 PM
Tags: Axel (1), bulldog (1), Cornerstone Sonoma (1), germander (2), honey bee (152)

Honey, I Hardly Know Ya

Honey bee sipping honey. (Photo by Kathy Keatley Garvey)

Ever been to a Farmer's Market and picked up a jar of honey advertised as "organic?" Is it organic? And if you're a beekeeper, has a consumer ever asked you if your honey is organic? How do you know? An inquiring mind--a beekeeper--asked Extension...

Posted on Monday, February 23, 2015 at 6:03 PM
Tags: Beekeepers Feast (2), Eric Mussen (189), honey (15), organic honey (1)

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

Organic farmers are struggling with invasion of exotic Virginia creeper leafhoppers in Lake and Mendocino counties. 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...

Conservation agriculture practices, such as reduced tillage and cover cropping, have proven soil building benefits. (Photo: NRCS) International Year of Soils celebrates a life-sustaining natural resource
Posted 2/13/2015 - In a move designed to raise awareness about a substance that is the very foundation of life on earth, 2015 has been declared the International Year of Soils by high-level national and global organizations, including the U.S. Department of Agriculture and...

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