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.
Meet the pollinators, And meet the UC Davis researchers, UC Master Gardeners, students and community members who study them or promote them. That's what's planned on Sunday, May 20 at an event sponsored by the UC Davis Arboretum and Public Garden and...
If you attended the second annual California Honey Festival, held recently in downtown Woodland, you probably heard the buzz. Or at least you saw the crowd circling Extension apiculturist Elina Lastro Niño of the UC Davis Department of...
Have you ever wondered what it's like to be a UC Davis doctoral student researching mosquitoes? Meet Olivia Winokur, an enthusiastic, dedicated and multi-talented medical entomologist whose childhood curiosity about a yellow fever vaccination sparked...
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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
Probiotics for plants: A new frontier for boosting crop production
Posted 5/11/2018 - The strawberry industry ended a long good-bye to methyl bromide in 2016. The fumigant had been used for decades to kill a wide range of soil-borne pathogens, weed seeds and insects, permitting the California strawberry industry to flourish. Scientists...
San Juan Bautista ‘plant nerd’ connects with UC Cooperative Extension
Posted 5/2/2018 - When San Juan Bautista resident Michael Cent was looking for ways to rehabilitate a large backyard pasture infested with invasive foxtail weeds, he called Devii Rao, the UC Cooperative Extension range and natural resources advisor in San Benito...
Microbes associated with plant roots could be a key to helping plants survive drought
Posted 4/25/2018 - As sorghum plants cope with drought conditions, the plants' roots and adjoining microbial communities are communicating in a chemical language that appears to improve the plants' chances under water stress. “It's amazing,” said Peggy Lemaux,...
Turning integrated pest management ideas into action
Posted 4/23/2018 - Pests have always been a bane of human existence. Modern society has developed effective pest management, “but there is no kind and gentle way to kill things,” said Brian Leahy, the director of the California Department of Pesticide...
Home is where the habitat is: This Earth Day, consider installing insectary plants
Posted 4/19/2018 - Help the environment on Earth Day, which falls on Sunday, April 22, this year, by growing insectary plants. These plants attract natural enemies such as lady beetles, lacewings, and parasitic wasps. Natural enemies provide biological pest control...