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

A Sign of the Times: Why This Black Walnut Tree Is Dying

Forest entomologists Steve Seybold (right) and Jackson Audley stand by a 150-year-old black walnut tree on the 100 block of E Street. It is dying of thousand cankers disease. (Photo by Kathy Keatley Garvey)

If you've ever walked into the courtyard on the 100 block of E Street in downtown Davis, Calif., you've probably noticed the massive black walnut tree near Sophia's Thai Bar and Kitchen. It's about 150 years old, measures about five feet in diameter,...

Posted on Friday, May 24, 2019 at 5:00 PM
Focus Area Tags: Agriculture,Environment,Innovation,Natural Resources,Pest Management

The Buzz About Bees: UC Davis Apiculturist in 'Science Friday' Program May 24

Extension apiculturist Elina Lastro Niño opens a hive at the Harry H. Laidlaw Jr. Honey Bee Research Facility, UC Davis. (Photo by Kathy Keatley Garvey)

"Bee" sure to tune in Science Friday, the National Public Radio program, tomorrow (May 24) at noon to hear the buzz about honey bees. Guests will be Extension apiculturist Elina Lastro Niño of the UC Davis Department of Entomology and...

Posted on Thursday, May 23, 2019 at 6:17 PM
Focus Area Tags: Agriculture,Environment,Family,Innovation,Pest Management,Yard & Garden

Hey, I'm Eating as Fast as I Can!

An immature lady beetle (larvae) chowing down on an oleander aphid. This photo was taken on a milkweed plant in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

Have you ever seen the larva of a lady beetle (aka ladybug) dining on an aphid? Lights! Camera! Action! So here is this charming little immature lady beetle chowing down on an oleander aphid that has the audacity to infest the milkweed in our...

Posted on Wednesday, May 22, 2019 at 5:27 PM
Focus Area Tags: Agriculture,Food,Health,Natural Resources,Pest Management,Yard & Garden

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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


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UC Blogs

Japanese knotweed. (Photo: National Park Service) UCCE lunchtime webinars to be offered during Invasive Species Action Week, June 3-7
When insects, animals, weeds and disease-causing microbes make their way into California from other parts of the nation or the world, the economic and environmental impacts can be catastrophic. A recent UN report that details the world's biodiversity...

Alejandro Del Pozo-Valdivia, UC Cooperative Extension entomology advisor in Monterey, Santa Cruz and San Benito counties, in an iceberg lettuce field in Chualar, Calif. UCCE advisor is tracking down answers to a lettuce aphid mystery
When Alejandro Del Pozo-Valdivia started his new job as UC Cooperative Extension entomology advisor in the Salinas Valley last year, he immediately faced an urgent problem in organic lettuce production. Pest control advisers were finding lettuce...

UCCE advisor Rachael Long (Photo: Evett Kilmartin) UCCE advisor Rachael Long receives prestigious award
Rachael Long, UC Cooperative Extension advisor covering integrated pest management for field crops in Yolo, Solano and Sacramento counties, is the recipient of the 2019 Bradford Rominger Agricultural Sustainability Leadership Award. Long will...

Douglas Iris from Certified California Naturalist Bruce Hartsough. The City Nature Challenge: A win for science and nature
All of our certified California Naturalists know how to use iNaturalist. Since uploading at least one observation is part of the course requirements, the City Nature Challenge was the perfect opportunity for Naturalists to reconnect with each other,...

UC Cooperative Extension vegetable crops specialist Jeff Mitchell shoots video for the vegetable production series. New video series to spark interest in vegetable production of the future
A 26-episode weekly video series will debut May 13 on YouTube to help train the next generation of vegetable crop workers and increase their use of effective stewardship practices in vegetable production. Projections for near-future retirements of...

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