Wine Industry Advisor reports that the California Department of Food and Agriculture is working with Costco and county officials after glassy-winged sharpshooter insects were found on grapevines sold at selected Northern California Costco stores between 21 April and 19 May. The pest spreads the bacterium that causes Pierce’s disease, a fatal grapevine disease, and officials have begun containment efforts, customer notifications and inspection guidance across affected counties.