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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 Hitchhiker

A lady beetle picks up a hitchhiker, an oleander aphid. (Photo by Kathy Keatley Garvey)

Oleander aphids, those cartoonish-looking yellow insects with black legs and cornicles, are commonly found on oleanders. Hence their name. But they also are partial to milkweeds, the host plant of the monarch butterfly. It's a daily challenge to rid...

Posted on Tuesday, August 4, 2015 at 8:10 PM

Butterfly Ballet

A Western tiger swallowtail nectarine on a butterfly bush. (Photo by Kathy Keatley Garvey)

If you plant it, they will come. Western tiger swallowtails (Papilio rutulus) can't get enough of our butterfly bush. For the first time ever, we saw two of them and managed to get both in the same image. Courtship? Curiosity? Chance...

Posted on Monday, August 3, 2015 at 8:34 PM

Got to Kill to Live

A camouflaged praying mantis dining on a bee. (Photo by Kathy Keatley Garvey)

Some folks dislike photos of praying mantids snagging, killing and eating their prey. Well, often the "eating" part comes before the "killing" part. Still, they have to kill to live. We all do.  Or someone does it for us. We've been seeing...

Posted on Friday, July 31, 2015 at 4:53 PM

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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

UC ANR experts believe schools and parks should be a priority for irrigation, even during the drought. Drought concerns causing unnecessary impact on landscapes and lawns
Posted 7/31/2015 - Following Gov. Brown's call to remove 50 million square feet of turf in California to conserve water, cities across state are now offering rebates to residents willing to pull out their plants and lawns. However, UC Agriculture and Natural Resources (UC...

Flames and smoke fill the sky behind a Southern California subdivision. Wildfires are unpredictable, but preparation can help protect homes and animals
Posted 7/29/2015 - Four years of drought has left California with acres of dry brush and dying trees, abundant fuel for wildfires. Currently, CalFIRE's fire map shows several major fires burning in California. “There are two factors that help fires spread - winds...

These almonds are still in the hull on the tree. Using the orchard biomass, hulls and shells for renewable power generation, soil amendment and dairy feed reduces the carbon footprint. California almonds have small carbon footprint compared to other protein foods
Posted 7/23/2015 - California produces more than 80 percent of the world's commercial almonds. Popularity of the nuts has spurred almond acreage in the state to expand from 510,000 acres in 2000 to roughly 890,000 acres in 2015, according to the USDA National Agricultural...

Harrison PNAS Drought is impacting California’s wildflowers
Posted 7/15/2015 - Native wildflowers in California are losing species diversity after multiple years of drier winters, according to a study from the University of California, Davis, which provides the first direct evidence of climate change impacts in the state's...

Letting lawn die does more harm than good. The drought needs not be a death sentence for lawns
Posted 7/13/2015 - While a golden brown lawn is seen as a badge of honor to some residents of drought-stricken California, in fact, they are doing more harm to the environment than good, says UC Agriculture and Natural Resources turf expert Jim Baird. “People have...

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