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

Lovin' the Lavender

The six-acre lavender fields on the Araceli Farms, on the outskirts of Dixon, glow during the Lavender Festival. (Photo by Kathy Keatley Garvey)

Lovin' the lavender... If you attended the Lavender Festival last weekend at the six-acre Araceli Farms at 7389 Pitt School Road, Dixon, you were in for a real treat. Planted in April 2017, the fields glowed with seven varieties of lavender: Grosso,...

Posted on Monday, June 24, 2019 at 4:20 PM
Focus Area Tags: Agriculture,Environment,Family,Health,Innovation,Natural Resources

Third Graders Learn About Pollinators

Wendy Mather (left) program manager of the California Master Beekeeper Program, explains the life cycle of bees to a group of third graders from Amador County. (Photo by Kathy Keatley Garvey)

(June 17-23 is National Pollinator Week.) "How many species of bees are there in the world?" asks Wendy Mather, program manager of the California Master Beekeeper Program (CAMBP), as she greets a group of third graders at the Häagen-Dazs Honey...

Posted on Friday, June 21, 2019 at 4:49 PM
Focus Area Tags: Agriculture,Environment,Family,Health,Innovation,Natural Resources,Yard & Garden

Golden Orbweavers Ignore Biological Rules

A female Trichonephila clavipes (formerly Nephila clavipes) is a giant compared to her small male (below). The research covers a complex pattern of sexual size dimorphism in this group of spiders, family Nephilidae. (Image copyright by Chris Hamilton, University of Idaho)

Size does matter. Have you ever wondered about sexual size dimorphism in the tropical spiders, the golden orbweavers? The females are sometimes 10 times larger and 100 times heavier than their male counterparts. And the webs that the females ...

Posted on Thursday, June 20, 2019 at 4:36 PM
Focus Area Tags: Environment,Innovation,Natural Resources

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

The yellow-faced bumble bee (shown on foxglove), native to the west coast of North America, is an important pollinator. Photo by Kathy Keatley Garvey We depend on pollinators
Happy Pollinator Week! For 2019, it's June 17-23. Most people think of bees when they think pollination, but don't stop there. “Think the "b" alliteration: bees, birds, butterflies, bats and beetles. But don't forget the flies, ants, mosquitoes...

pollinator poster California Naturalists' efforts benefit pollinators
'Attention is the beginning of devotion' --Mary Oliver This quote resonates this month, amidst a variety of environmental holidays and celebrations including World Environment Day, World Ocean Day, California Invasive Species Action Week, and finally...

In dairies with milking robots, cows voluntarily walk into a sophisticated, computerized box when they are ready for milking. UC helps California dairy farmers experiment with milking robots
Early in the 20th century, dairy operators traded their milking stools for machines to produce enough dairy products to meet growing consumer demand. The technological developments were critical to the formation of California's enormous dairy industry,...

Invasive species threaten California's landscapes. Invasive species threaten California’s economy and ecology
When insects, weeds, animals and diseases enter California from elsewhere in the nation or world, they can cause economic losses to agricultural crops and ecological damage to the state's natural areas. Ultimately, invasive species affect every resident...

UC ANR teams with  other universities, government agencies, non-profit organizations, landowners and California residents in the fight to prevent, eradicate or control invasive species. A team approach is key to conquering invasive species
The UC Integrated Pest Management Program and the Center for Invasive Species Research are two UC Agriculture and Natural Resources programs that monitor invasive species and coordinate responses when they become established in the state. They work...

Webmaster Email: