UC Cooperative Extension
ACP (Asian citrus psyllid) found in San Joaquin county
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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.
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A fly, oh, my! On the approval scale, they don't rank nearly as high as honey bees, but some are often mistaken for them. Take the Eristalis stipator, which belongs to the family Syrphidae, the hover flies. It's about the same size as a honey bee and...
Varroa mites--considered the No. 1 enemy of beekeepers--will be among the topics discussed when Gene Brandi of Los Banos, Calif., president of the American Beekeeping Federation, speaks at the 40th annual conference of the Western Apicultural Society, to...
Monarch butterflies aren't the only insects that hang around milkweed, their host plant. You're likely to see a variety of predators, such as the European paper wasp, Polistes dominula. This paper wasp is a little skittish around paparazzi so it helps...
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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
August 19th is National Honey Bee Day: Dr. Elina Niño reminds us to help honey bees cope with pests
Posted 8/17/2017 - National Honey Bee Day is celebrated on the third Saturday of every August. This year it falls on Saturday the 19th. If you use integrated pest management, or IPM, you are probably aware that it can solve pest problems and reduce the use of pesticides...
New dust sources resulting from a shrinking Salton Sea have negative ecological and health impacts
Posted 8/8/2017 - UC Riverside study shows soils once submerged under the sea and airborne particulate matter are high in sodium and selenium Scientists at UC Riverside investigating the composition of particulate matter (PM) and its sources at the Salton...
How to check your citrus trees for a deadly disease and the pest that spreads it
Posted 7/28/2017 - The incurable citrus tree disease huanglongbing, or HLB, has been detected in Los Angeles and Orange counties and most recently in Riverside. The citrus disease is spread from tree to tree by Asian citrus psyllids, the insects that move...
UC has boots on the ground in an unrelenting search for Asian citrus psyllid
Posted 7/28/2017 - With two magnifying loops around her neck and a truck stocked with vials and tools for insect collection, Joanne O'Sullivan scouts Ventura County citrus orchards every day. She walks the perimeter, examining newly emerging leaves and tapping branches...
UC scientist gives orchards a whole new color scheme
Posted 7/25/2017 - For centuries, farmers have used all the colors of the rainbow to assess their orchards: The bright pink of blossoms in springtime, the vibrant green of heathy leaves, the red blush on fruit ready to harvest. However, there are wavelengths beyond what a...