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

Do You Know Where Your Pollinators Are?

European paper wasps protecting the nest they're building on the lip of a recycling bin near the Mann lab, UC Davis campus. (Photo by Kathy Keatley Garvey)

It's National Pollinator Week. Do you know where your pollinators are? If you're thinking bees, butterflies, beetles, birds (hummingbirds) and bats, you're correct. But what about European paper wasps (Polistes dominula)? They're pollinators, too, says...

Posted on Wednesday, June 19, 2019 at 4:20 PM
Focus Area Tags: Environment,Yard & Garden

A Case of Survival of the Flittest

Western tiger swallowtail, Papilio rutulus, nectaring on verbena in the Kate Frey Pollinator Garden, Sonoma Cornerstone. (Photo by Kathy Keatley Garvey)

If you visit the Kate Frey Pollinator Garden at Sonoma Cornerstone--and you should, especially during National Pollinator Week--you'll see honey bees, bumble bees, butterflies and hummingbirds, among other pollinators.  Today we spotted a male...

Posted on Tuesday, June 18, 2019 at 5:15 PM
Focus Area Tags: Agriculture,Environment,Innovation,Natural Resources,Yard & Garden

In Praise of Bumble Bees

A yellow-faced bumble bee,Bombus vosnesenskii, foraging on a tower of jewels, Echium wildpretii, in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

When was the last time you sighted a bumble bee? Photographed it? It's National Pollinator Week and one of our favorite bumble bees is the yellow-faced bumble bee, Bombus vosnesenskii. It was also a favorite of internationally renowned bee expert Robbin...

Posted on Monday, June 17, 2019 at 4:50 PM
Focus Area Tags: Agriculture,Environment,Innovation

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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

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...

A symptom of HLB in citrus is the yellowing of leaves on an individual limb or in one sector of a tree's canopy. (Photo: Citrus Pest and Disease Prevention Program) Huanglongbing is a growing threat to California’s citrus industry
Huanglongbing (HLB) is a devastating bacterial disease of citrus that is starting to spread rapidly in urban areas of Southern California. The disease is spread by the invasive insect Asian citrus psyllid. Asian citrus psyllid was first identified in...

SFREC director Jeremy James stands next to a small chamber designed to simulate effects of warming air and soil temperatures on rangeland grasses. The poly carbonate hexagons slow rates of heat loss from plots, allowing scientists to artificially warm plants and soils in the chambers. (Photo: Linda Forbes) UC ANR research to determine future climate change impacts today
Scientific evidence of a warming climate in California and across the globe is clear, but the impacts on ecosystems and agriculture are still difficult to predict. Sophisticated computer models are used to forecast future climate. Understanding that...

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