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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 Bees Have It!

Bee scientist Marla Spivak of the University of Minnesota keynoted  the first-ever UC Davis Bee Symposium. (Photo by Dan Marshall)

If you missed the first-ever UC Davis Bee Symposium on keeping bees healthy, not to worry The event, hosted May 9 in the Robert Mondavi Institute for Wine and Food Science by the Honey and Pollination Center and the UC Davis Department of Entomology and...

Posted on Friday, May 29, 2015 at 5:54 PM

Sleeping in the Lavender

A male black-faced bumble bee, Bombus californicus, sleeps on a lavender blossom. (Photo by Kathy Keatley Garvey)

It's a delight to see boy bumble bees sleeping overnight in the lavender. Two species of bumble bees--Bombus vosnesenkii and Bombus californicus--have been slumbering in our lavender for the past several weeks. Sometimes they nestle a half inchs from...

Mark Winston to Relate Lessons from the Hive

Bee hives in a sunflower field along Pedrick Road, Dixon, Solano County, in July 2012. (Photo by Kathy Keatley Garvey)

Lessons from the hive! Sound familiar? Honey bee scientist and noted author Mark Winston will speak on “Bee Time: Lessons from the Hive” at a special seminar hosted by the UC Davis Department of Entomology and Nematology on Friday, June 5...

Posted on Wednesday, May 27, 2015 at 5:40 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

A new vaccine developed by veterinary immunologist Jeff Stott shows promise for preventing foothill abortion disease, which kills calves before or at birth. (Don Preisler/UC Davis School of Veterinary Medicine photo) Vaccine field trials for deadly 'foothill abortion' cattle disease expand
Posted 5/27/2015 - Cattle ranchers in California, Nevada and Oregon are one step closer to having a vaccine available to treat a tick-borne bacterial disease – commonly known as foothill abortion – which kills cow fetuses. The USDA approved the...

Pacific fisher Public to weigh in on Sierra Nevada forest recommendations May 27
Posted 5/22/2015 - To protect forests and homes from wildfire, vegetation is often removed to reduce fuel for a fire. But how do those forest management treatments affect fire risk, wildlife, forest health and water? Since 2006, a team of University of California...

People and cattle can peacefully coexist on working rangelands. (Photo: Pixabay) People and cattle can share open space
Posted 5/7/2015 - When a hiker on a San Francisco Bay Area parkland unknowingly walked between a cow and her calf, the mother came over, knocked the hiker down and stepped on him. In another incident, a woman walking her dogs off leash was chased by cows. She slipped and...

An adult honey bee on a white clover blossom.  Photo by Jack Kelly Clark Bee kind to pollinators – Use integrated pest management to reduce pesticide use
Posted 5/6/2015 - The importance of pollinators – such as bees, butterflies, moths, and hummingbirds – is becoming more widely known. Bees pollinate approximately 35 percent of the food we eat. Pollinators as a whole are worth about $15 billion to the...

Fuller rose beetles emerged and laid eggs throughout winter 2014-15. Usually their development is slowed by cold winter weather. Mild winter gave agricultural pests a head start in 2015
Posted 5/5/2015 - San Joaquin Valley farmers are facing an unusually high pest population this spring due to the milder than normal winter, and rapidly warming spring conditions, says a UC Agriculture and Natural Resources entomologist. “I've never seen this happen...

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