UC Cooperative Extension
ACP (Asian citrus psyllid) found in San Joaquin county
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.
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...
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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
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 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...
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...
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...
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...