- On this page you can get some general information on the Glassy-Winged Sharpshooter (GWSS) and some updated information on Contra Costa County's current Sharpshooter status.
- On the Identification page you can find valuable information on identifying the insect as well as pictures that will help in identifying the Sharpshooter's behavior.
- The Concerns page will contain information on how devastating GWSS can be, what crops and ornamental plants they can destroy, and other problems caused by the Sharpshooter.
The Glassy-Winged Sharpshooter is a serious threat to California's agriculture. The Sharpshooter is native to the southeastern United States, but was probably introduced to California around 1990. The insect currently infests most of southern California and some of Fresno, Imperial, Kern, Santa Barbra, Santa Clara, and Tulare counties. If you wish to see a map of California that shows infested and partially infested counties then you can go to CDFA's Glassy-Winged Sharpshooter Distribution Page
. In the partially infested counties eradication measures are being taken. In southern California limited releases of a particular wasp in the genus Gonatocerus
is being used to help control the populations of the Sharpshooter. This wasp will parasitize only 10 - 50% of the eggs of the Sharpshooter during the first egg laying season, but it can kill up to 100% of the second generation.
What should I do if I find Sharpshooter eggs nymphs or adults?
If you find any traces of the sharpshooter you should notify your local county's Department of Agriculture.
In Contra Costa County the phone number is
If you live near Concord and can drop off a sample we are located at
2366-A Stanwell Circle
Concord, CA 94520-4807
Or if you are near Knightsen, the field office is located at:
3020 Second Street
Knightsen, CA 94548
(corner of Second and Delta Road)
Their phone number is (925) 427-8610
Anywhere else in California you can call the California Department of Food and Agriculture hotline at
California Department of Food and Agriculture - GWSS
California Farm Bureau - GWSS
University of California Integrated Pest Management
Berkeley's slideshow presentation on Pierces Disease
Ventura County's IPM page
California Association of Wine Growers
UC Agriculture and Natural Resources