The California Department of Food and Agriculture is working with Costco to track and destroy grapevines infested with glassy-winged sharpshooters, which spread Pierce's disease. - The pest was found on grapevines sold at Costco in 23 California counties between April 21 and May 21.
- Infested stock came from Burchell Nursery in Fresno; all life stages of the sharpshooter have been detected. - Napa County reported 220 grapevines received, 63 destroyed, 157 unaccounted for.
- CDFA urges buyers to isolate plants and contact local agricultural commissioners. Pierce's disease costs California $110 million annually, and infected plants must be destroyed as there is no cure.