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.
Noted medical entomologist William Hazeltine II (1926-1994) made a difference. Today he continues to make a difference through his legacy--supporting mosquito research of UC Davis graduate students. Hazeltine, a U.S. Navy veteran who studied entomology...
It's a day that rice growers look forward to. Bugs, not so much. Because they're targeted. Especially the fall armyworms. California's 2015 rice season indicated unprecedented levels of armyworms--the highest of the last 25 years, according to...
A soap opera is usually defined as a drama performed as a serial on daytime TV. But soapberry bugs and the people who study them are much more interesting! Forget the soaps; let's talk about soapberry bugs and an entomologist at the University of...
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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
California's new groundwater law leaves unanswered questions
Posted 8/25/2016 - The Sustainable Groundwater Management Act (SGMA) is a revolutionary law that will have profound impacts on the state's agriculture industry, however, it also leaves out many implementation details, according to Michael Kiparsky, director of the Wheeler...
Protect bees from pesticides by using bee precaution ratings from UC IPM
Posted 8/22/2016 - Various insects, birds and other animals pollinate plants. Bees, especially honey bees, are the most vital for pollinating food crops. Many California crops rely on bees to pollinate their flowers and ensure a good yield of seeds, fruit and nuts....
The battle against Aedes aegypti, the mosquito that spreads Zika
Posted 8/22/2016 - The UC Mosquito Research Laboratory in Parlier is the epicenter of California research on the Aedes aegypti mosquito, a tiny, black and white mosquito that can spread the Zika virus. Aedes aegypti were first identified in California in June 2013, when...
New law requires annual training for anyone applying pesticides at school sites
Posted 8/17/2016 - School is already back in session for many children in districts throughout California, and several others will be starting back to school in the next couple of weeks. While students and teachers were enjoying summer break, an amendment to the Healthy...
Recreation on private land offers potential for conservation
Posted 8/9/2016 - Successfully integrating human activities with ecosystem conservation forms the foundation of sustainability and is key to maintaining biological diversity. A new study has found that recreational use of private land in the U.S. could have significant...