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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

Why Flies Are Pollinators, Too!

A hover fly collecting pollen on a Mexican sunflower (Tithonia). (Photo by Kathy Keatley Garvey)

Will all the pollinators please stand up! Or do a fly-by like the Blue Angels or a crawl-by like babies competing in a diaper derby. Bees--there are more than 4000 of them in North America--are the main pollinators, but don't overlook butterflies,...

Posted on Wednesday, October 7, 2015 at 6:57 PM

The Aphid Eater

A lady beetle munching on an aphid while another aphid (far right) looks on. (Photo by Kathy Keatley Garvey)

The circle of life... Monarch caterpillars feast on milkweed, their host plant.  Oleander aphids feast on the juices of milkweed plants. Lady beetles, better known as ladybugs (but they're beetles, not bugs) feast on the aphids.  The milkweed...

Posted on Tuesday, October 6, 2015 at 5:20 PM

To 'Catch' a Dragonfly

A wind-whipped female variegated meadowhawk, a Sympetrum corruptum. (Photo by Kathy Keatley Garvey)

Dragonflies are fierce predators but they are predator-shy.  "If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck," as the saying goes. If you look like a predator, walk or fly like a predator and act like...

Posted on Monday, October 5, 2015 at 7:02 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

Cows feed at a California dairy. (Photo: Wikimedia Commons) Antibiotic drug use in food animals focus of October workshop
Posted 10/8/2015 - New guidelines being implemented by the U.S. Food and Drug Administration – effective Jan. 1, 2017 - require label changes allowing only therapeutic uses of some medically important antimicrobial drugs, and call for increased veterinarian oversight...

Leaving sufficient dry matter on rangeland prevents soil erosion and creates a conducive environment for diverse plant communities to thrive. Low residual dry matter on rangeland a concern heading into wet season
Posted 10/2/2015 - Over the past few years, drought has negatively affected everyone in the state and ranchers are no exception. Due to the drought, most areas have seen a decline in forage production and water availability, and as a result many livestock producers reduced...

Organic matter from the garden can be turned into compost and added to landscape soil to increase water holding capacity. Use compost for water conservation
Posted 9/28/2015 - Some of the best practices for maintaining healthy home gardens and landscapes also cut water use, a particularly important benefit during the drought. That's the case with compost. UC Agriculture and Natural Resources' environmental horticulture...

These bay laurel leaves show P. ramorum symptoms. Sudden oak death moving to urban areas; 3 steps to protect oaks
Posted 9/25/2015 - Drought is decreasing but not defeating the pathogen that causes sudden oak death, according to a citizen science-assisted survey conducted this spring by a UC Agriculture and Natural Resources forest pathologist. Results of the 2015 Sudden Oak Death...

rangeland Children’s magazine focuses on rangeland animals
Posted 9/24/2015 - Rangeland is where deer and antelope play. It is also home for grazing livestock and many other animals. “Almost half of the land on Earth is rangeland and one-third of the United States is rangeland,” the latest issue of Jr. Animal Scientist...

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