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

It Was a Scorpion Kind of Day at the Bohart Museum of Entomology

Logan Loss, 6, of Rocklin talks about scorpions to Bohart associate and scorpion scientist Wade Spencer. The kindergarten student is an avid scorpion enthusiast. Also pictured are members of the Vacaville Brownie Girl Scout Troop (from left) Jayda Navarette, Keira Yu and Kendl Macklin, front. (Photo by Kathy Keatley Garvey)

Little Logan Loss of Rocklin is only 6 but already he knows more about scorpions than many, if not most, adults do. Logan, a visitor at the Bohart Museum of Entomology's recent open house on spiders and other arachnids, wowed the crowd with his...

Posted on Tuesday, April 23, 2019 at 3:51 PM
Focus Area Tags: Environment,Family,Innovation,Natural Resources

Sarah Stellwagen: On the Trail of Spider Glue

A redfemured spotted orbweaver, Neoscona domiciliorum, photographed in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

Spider glue: it's a sticky subject but there's much more to it than that. "Most people are unaware of the glue on a spider's web because you can't see the droplets with your naked eye, but it's a really important feature of the web that spiders rely on...

Posted on Monday, April 22, 2019 at 9:19 AM
Focus Area Tags: Environment,Innovation,Natural Resources

Butterfly Summit: Are Butterflies Heralds of Apocalypse?

A male monarch seeking nectar in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

"The butterfly counts not months but moments, and has time enough," wrote the late poet Rabindranath Targoe (1861-1941) of Bengali, who won the Nobel Prize in Literature in 1913. There may not be "time enough" for some species that are rapidly...

Posted on Friday, April 19, 2019 at 3:33 PM
Focus Area Tags: Agriculture,Environment,Family,Food,Health,Innovation,Natural Resources

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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

A possible climate change outcome in California may be returning farmland to less-intensive uses, such as grazing. UC Cooperative Extension ramps up its climate change response
While scientific reports continue to mount confirming that global climate change is increasing temperatures, causing more frequent weather extremes and raising the sea level in California, UC Cooperative Extension is working to ensure the worst...

Insectary plants Home is where the habitat is: This Earth Day, consider installing insectary plants
Help the environment on Earth Day, which falls on April 22, by growing insectary plants. These plants attract natural enemies such as lady beetles, lacewings, and parasitic wasps. Natural enemies provide biological pest control and can reduce the...

All California Naturalists use the iNaturalist app. Documenting urban nature in the City Nature Challenge April 26-29
Have you ever been on a walk and observed an interesting plant you couldn't identify? Encountered an unusual insect trapped in your home? Have you wondered why you used to see certain species in nature and you don't now? Or have you thought it might be...

December 1968 Earth rise. Earth Day history can inspire us all
My father was ahead of his time. Years before Americans were asked to, Jim Hayden ensured that our family conserved energy by keeping the thermostat low, turning off lights and taking "military" showers to reduce water use. My father also observed the...

Ghost pines, live oaks, black oaks and madrones, among other trees, make their stand interspersed with annual and perennial grasses at the headwaters of a California watershed. (Photo: David Lewis) Headwaters
I have the privilege of engaging California's communities with the aspiration of safeguarding the sustenance and well-being that its oak-woodland watersheds and the people that are a part of them provide. This millennia-long integrated relationship of...

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