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.
Want to feel the buzz? If you're a beekeeper and have kept bees for at least a year, you might want to become a Master Beekeeper. The E. L. Niño Bee Lab, directed by Extension Apiculturist Elina Lastro Niño, University of California,...
From her post at Texas A&M University, located at College Station, 90 miles northwest of Houston, Christine Merlin basically has a front-row seat for the monarch butterfly migration. She sees them heading to Mexico to overwinter, and she sees them...
Ever seen a mob of tiny sweat bees? The bees below, from the genus Lasioglossum (as identified by native pollinator specialist Robbin Thorp, distinguished emeritus professor of entomology at the University of California, Davis), just about...
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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
Researchers see more overhead irrigation in California’s future
Posted 5/26/2016 - Overhead irrigation systems have revolutionized agriculture across the United States and in other parts of the world, using less water than furrow irrigation and requiring significantly less labor and maintenance than drip systems. But in California, the...
New book traces Los Angeles’ transformation from cows to concrete
Posted 5/13/2016 - After thousands of years as a sparsely populated coastal plain, the Los Angeles Basin underwent two dramatic transformations in the last century and a half, first into an agricultural powerhouse and then into mile upon mile of wall-to-wall American dream...
Fire devoured chaparral plots at UC facility to set up a research project
Posted 5/5/2016 - Firefighters set two hillsides ablaze at the UC Hopland Research and Extension Center (HREC) in April, sending flames 50 feet into the air while dense, chest-high chaparral was reduced to a moonscape – all in the name of science. The prescribed...
IPM and pesticide safety a desperate need in Myanmar
Posted 5/5/2016 - Myanmar (formerly Burma) is located in Southeast Asia, bordered by Bangladesh, India, China, Laos and Thailand. I was asked by the United States Agency for International Development (U.S. AID) to travel to Myanmar to use my training and experience as an...
Fighting drought with soil
Posted 5/2/2016 - A team of University of California scientists recently received a $1.69 million grant to use several UC agricultural research stations to study an often overlooked tool to fight the drought: soil. The team, led by Samantha Ying, an assistant professor...