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 systems in plants, drying them out. The disease is incurable.
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