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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

When Material Possessions Tear at the Very Fabric of Our Lives

Monarch butterfly spreading its wings. (Photo by Kathy Keatley Garvey)

When material possessions tear at the very fabric of our lives, it's time to re-weave and re-think. “Gimme more, gimme more, gimme more!” seems to be the mantra of the rich and famous and the faux rich and famous. From my perspective: It's...

Posted on Thursday, November 26, 2015 at 1:00 AM

Insect Art in the Garden

The tiny yellow egg of a Gulf Fritillary glows in the early morning sun. (Photo by Kathy Keatley Garvey)

If you look closely, you'll not only see the cycle of life in your garden, but art as the center of life. Take the Gulf Fritillaries. They're a stunning orangish-reddish butterfly (Agraulis vanillae) with silver-spangled underwings. It's a delight...

Posted on Wednesday, November 25, 2015 at 1:34 PM
Tags: adult (4), Art Shapiro (102), butterflies (29), caterpillar (8), chrysalis (4), egg (5), Gulf Fritillaries (5), mating (3), passionflower vine (14), UC Davis (60)

The Unpredictable Monarchs

A male (left) and female monarch on a scarlet milkweed. (Photo by Kathy Keatley Garvey)

You never know what they will do. When you release newly emerged monarch butterflies (Danaus plexippus), some linger in the comfort of your hand. Some soar high into the sky. Some flutter to a nearby bush or tree.  When we released two newly...

Posted on Tuesday, November 24, 2015 at 2:18 PM

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

Good fencing is one tool that allows coyotes and sheep to share the open range. Living with wildlife while managing working landscapes
Posted 11/23/2015 - The UC Hopland Research and Extension Center (UC HREC) will host workshops on Dec. 1 and 2 to foster understanding and encourage community dialog about ranching on a landscape with populations of coyote, black bear, mountain lions and other...

Shasta Lake in 2009. El Niño precipitation may help refill the lake after four years of drought. (Photo: CC BY 3.0 by Apaliwal via Commons) El Niño expected to drench California
Posted 11/19/2015 - Brace yourself for El Niño. All major climate models indicate that the current El Niño will be the strongest on record in terms of sea surface temperature departures from normal. Climate scientists refer to the anomaly as ENSO, for El...

Elise Gornish, UC ANR Cooperative Extension specialist in restoration ecology, and John Parodi, restoration program manager for Students and Teachers Restoring our Watersheds, looking at a 10-year-old stream restoration project. Counties can offset greenhouse gas emissions with stream restoration
Posted 11/9/2015 - The revegetation of streams and creeks that crisscross California rangeland can play a significant role in helping counties meet carbon emission standards. “We have long known that stream revegetation improves wildlife habitat and...

Backyard chickens are susceptible to avian flu spread by birds migrating on the Pacific flyway. (Photo: Wikipedia) Reduce the risk of bird flu in backyard chickens
Posted 11/4/2015 - With a potential increase in avian influenza this fall when wild waterfowl migrate south from their northern breeding grounds, chicken owners should be extra vigilant to help avoid their birds contracting or passing the virus.  Protecting their...

After a forest fire, burned trees both standing and on the ground, help protect the soil from erosion. Burned forestland needs erosion protection
Posted 11/4/2015 - Many forest areas burned by wildfires this year are now facing a new threat – erosion. A UC Agriculture and Natural Resources expert says there are steps landowners can take to reduce the risk of losing soil and polluting waterways when rain...

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