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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 Effect of the Drought on Insects

he drought has caused a number of immature praying mantids to die for lack of food.  This is a female female Stagmomantis californica, as identified by Andrew Pfeiffer. (Photo by Kathy Keatley Garvey)

The severe California drought--we're in the fourth year--is affecting us all, but it's also affecting insects, says Lynn Kimsey, director of the Bohart Museum of Entomology and professor of entomology at the University of California, Davis. She writes...

Posted on Friday, August 28, 2015 at 6:16 PM

The Spider and the Skipper

A banded garden spider (Argiope trifasciata)--as identified by UC Davis distinguished professor Art Shapiro--waits for prey. (Photo by Kathy Keatley Garvey)

This is a a story about a spider and a skipper. Technically, a banded garden spider (Argiope trifasciata) and a fiery skipper butterfly (Hylephila phyleus, family Hesperiida). The garden spider lies in wait, its head down, clinging to its real...

Posted on Thursday, August 27, 2015 at 5:55 PM

'The Sting' Revisited

The Sting: A bee stings the wrist of Extension apiculturist Eric Mussen. That's the abdominal tissue trailing. (Photo by Kathy Keatley Garvey)

Photographers are frustrated, and rightfully so, with all the thievery on the Internet. Like many other photos, "The Sting," is being used illegally for commercial purposes. It's appeared on sites like PhotoBucket where unscrupulous people sell it...

Posted on Wednesday, August 26, 2015 at 7:32 PM
Tags: bee sting (9), copyrighted image (1), Eric Mussen (201), The Sting (3), The Sting (3), viral (1)

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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


Event Name

UC Blogs

UC ANR expert says plant nurseries have a need for neonicotinoid pesticides. UC hosts conference on widely used pesticide threatened with prohibition
Posted 8/27/2015 - Neonicotinoid pesticides are at the center of a global storm. Implicated in the mysterious deaths of honeybees, neonics (as they are often called for short) were banned in Europe for two years in 2014. In Canada, neonics have been banned in Ontario and...

Missy Gable, director of the UC Master Gardener Program, works on video series. Video series with water saving tips debuts
Posted 8/24/2015 - The University of California Master Gardener Program offers simple tips for saving water in home landscaping in a six-part video series that debuts today, Aug. 24. In the first episode, embedded below, UC Master Gardener director Missy Gable tells...

Grapes in hand UCCE intern reflects on her summer experiences
Posted 8/21/2015 - There is a mysterious sort of feeling that comes with being in a vineyard very early in the morning. It's tranquil and cool; it deceives you into thinking the temperatures won't be sweltering in a mere few hours. Surrounding alfalfa fields sweeten the...

Water conferences set course for sustainable water security. International and California water conferences shine new light on lingering drought
Posted 8/20/2015 - The gauge reads 105 degrees in California's state capital as this article is being drafted. The four-year drought has baked itself into the landscape, with dead lawns crunching under feet and trees wilting under the heat, and has so far stolen a year's...

Hedgerow planted in Yolo County. Hedgerows next to crops can enhance pest control
Posted 8/18/2015 - Research has shown that hedgerows of native California flowering shrubs planted along the edge of a crop field helps keep crop pests under control by increasing the activity of natural enemies. UC Agriculture and Natural Resources and UC Berkeley...

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