Agricultural officials warn about an invasive pest found on Costco grapevines. - The glassy-winged sharpshooter can spread Pierce's disease, killing grapevines.
- Plants were sold in Northern California, including Napa County, from April 21 to May 19. - Residents should isolate plants and contact county officials for inspection.
- The food supply is not affected, but vineyards are at risk. Napa County residents are urged to take immediate action to prevent the pest's spread.