A destructive pest, the glassy-winged sharpshooter, has been found on grapevine plants sold at Napa and Chico Costco locations, threatening California's wine industry. - The pest was detected on grapevines sold at Napa Costco, with Chico Costco also confirming sales of about 200 plants since April 21.
- The glassy-winged sharpshooter is a vector for Pierce's disease, which can kill grapevines by blocking water and nutrient flow. - Agricultural officials are tracing and containing the spread, urging customers to report purchases.
- The discovery raises alarm for California's multibillion-dollar wine industry.