An urgent alert was sent Tuesday from Napa County’s agricultural commissioner regarding an infestation of the glassy-winged sharpshooter insect on grapevines sold at Costco Wholesale and found in shipments across Napa, Sonoma, Marin, Solano and Yolo counties. Glassy-winged sharpshooters, with an appearance similar to crickets, can cause Pierce’s disease, a bacterial infection that blocks water-conducting […]