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.
“I’ve got black bumblebees buzzing around our backyard like crazy,” the caller said. “They’re loud. Very loud. They’re dive-bombing and scaring the cat and dog. I’ve never seen anything like...
Ouch! So, you’ve been stung by a bee. If you’re a beekeeper, an occasional sting is a natural part of beekeeping. UC Davis apiculturist Eric Mussen says that the average beekeeper may be stung approximately 3000 times a year. Mussen...
I've always loved the wit and wisdom of insect-inspired poets. God in His wisdom made the fly And then forgot to tell us why. - - Ogden Nash "The Fly" We hope that, when the insects take over the world, they will remember with gratitude how...
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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
The sweet smell of grapevines in bloom
Posted 5/13/2009 - Grapevines throughout California are now blooming. The flowers have a powerful and unique scent that reminds me of an herbal shampoo. Recently it was discovered that the characteristic odor of grapevine flowers is emitted from...
How do I provide structural support for my grape vines?
Posted 4/30/2009 - Strong structural support is needed to support the vines and crop; this can be a trellis, an arbor, or a fence. Many gardeners grow grapes on an arbor to provide both shade and fruit. A trellis provides the easiest method . . . Learn more
How do I start seeds indoors?
Posted 4/24/2009 - Starting your vegetables indoors early can give your garden a jumpstart on spring. It also reduces the cost of seedling transplants in that a packet of seeds cost about the same as 1, 4-inch tomato plant. It also allows you to grow seedlings of varieties...
Minimizing fungicide resistance
Posted 4/14/2009 - Grapevine powdery mildew is a pathogenic fungal disease of grapes, the management of which is a yearly challenge for California grape growers. Since the mid-80’s, multiple fungicides have been registered for grapevine powdery mildew management. The...
Protecting grapevines from Phomopsis Cane and Leaf Spot
Posted 4/2/2009 - With the prediction of rain next Monday (April 6th), Valley growers should consider applying a fungicide to protect young succulent growth from Phomopsis infections. Spring showers create optimal conditions for Phomopsis viticola pycnidia to...