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.
It was great to see the Entomological Society of America (ESA) select "neonicotinoids" as a student debate topic for its recent meeting in Portland, Ore. Bee health is a challenge, and this hot topic tied in with ESA President Frank Zalom's theme "Grand...
If you should ask Extension apiculturist (emeritus) Eric Mussen of the University of California, Davis, whether he believes that neonicotinoids are the primary cause of colony collapse disorder (CCD), he will say answer you fair and square: "No, they're...
Two's company. Three's a crowd? Not necessarily. Sometimes we wish it were half a dozen. Last July we were admiring two newly emerged Gulf Fritillary butterflies on Mexican sunflowers (Tithonia) when a Western Tiger Swallowtail fluttered down,...
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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
Oh the weather outside is fungal - It’s like a mushroom jungle
Posted 12/17/2014 - Mushrooms are popping up all over California thanks to the wet rainy weather we have had across the state recently. They seem to magically appear overnight, like umbrellas on a sunny beach day. This fascinating occurrence doesn't actually happen...
New GMO alfalfa holds exciting possibilities, UC expert says
Posted 12/16/2014 - Good news for dairy cows. Science has found a way to produce alfalfa with less lignin, a component of the plant that has no nutritional value. The new alfalfa variety – genetically modified in a way that puts brakes on the lignin-producing gene...
Teaching teachers about the environment outdoors
Posted 12/12/2014 - One approach to improving science literacy of children is to train their teachers in environmental education. Using the forest as a classroom, Project Learning Tree, now a program delivered through UC Cooperative Extension, educates teachers about the...
Christmas tree farmers growing Nordmann fir asked to look out for new pest
Posted 12/5/2014 - California Christmas tree growers who have planted Nordmann or Turkish fir on their farms should be watchful for a new pest that recently made its way to the United States, said Lynn Wunderlich, UC Cooperative Extension advisor who works with Christmas...
Drought talk draws ranchers, researchers and climatologists
Posted 11/26/2014 - California's severe drought is entering a fourth year. With that, scientists met with ranchers to give background and gain feedback on a key climate indicator: the U.S. Drought Monitor. The November 7 workshop held at the University of...