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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

How Small Is Small?

A lady beetle, a monarch caterpillar and an infestation of oleander aphids. (Photo by Kathy Keatley Garvey)

Sometimes in a world of towering skyscrapers, jumbo jets and warehouses big enough to hold a small planet--or at least a state the size of Rhode Island--we don't realize how “small” small is. Last weekend it was a veritable insect feast...

Posted on Wednesday, September 2, 2015 at 6:36 PM

Thank You, Mrs. Monarch!

A monarch caterpillar chowing down milkweed. (Photo by Kathy Keatley Garvey)

Thank you, Mrs. Monarch. Thank you for laying your eggs on our newly planted narrowleaf milkweed. We planted the narrowleafed milkweed last spring, hoping we could coax you to come. We laid out a floral welcome mat for you with some of your...

Posted on Tuesday, September 1, 2015 at 5:27 PM

Yes, It Happens: Sexual Cannibalism in Praying Mantids

A mating pair of praying mantids. At left is the male, soon to lose his head. (Photo by Kathy Keatley Garvey)

Yes, it happens. We've heard the stories and read some of the scientific literature about what a female praying mantis will do to her partner during the mating process. Sexual cannibalism. She'll bite the head off of her mate and eat it--but the mating...

Posted on Monday, August 31, 2015 at 8:15 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

Scientists count plants to assess restoration. Photo by L. Ziegenhagen UC to host ecological restoration workshop on Nov. 5
Posted 9/2/2015 - Restoration practitioners, native plant nursery employees, scientists, policymakers and others who are concerned about preventing the spread of pests, pathogens and disease through ecological restoration activities are invited to a UC Agriculture and...

A hike to the Hollywood sign lends a far-off view of downtown beyond Griffith Park. Even without rain, the California Naturalist Program blooms in Southern California
Posted 9/2/2015 - In the concrete jungle of Los Angeles, people sometimes forget that Southern California actually has a wealth of natural open spaces. From the Mojave desert to four National Forests, Southern California supports vast wilderness spaces, many just a...

It's best to irrigate early in the morning. (Photo: Ricardo Bernardo) Second video in series helps Californians conserve more water
Posted 8/31/2015 - Californians cut water use in July by 31.3 percent compared to the same month in 2013, exceeding Gov. Brown's 25 percent mandate for the second consecutive month, the California State Water Control Board reported last week. With dry conditions forecast...

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...

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