Grape plants sold at Costco locations in Stockton, Lodi, Manteca, and Tracy, California, have been found to contain the glassy-winged sharpshooter, an invasive insect that spreads Pierce's disease, which can devastate grapevines and other crops. Discovered by inspectors from the San Joaquin County Agricultural Commissioner's Office, the pest poses a significant threat to California's agriculture, particularly the grape industry. Although Costco is not responsible for the infestation, which originated from a Fresno County nursery, officials are collaborating with the retailer to identify affected plants and prevent further spread. Customers who purchased these plants between April 21 and May 19 are advised to contact local agricultural authorities for inspection. Residents are instructed to isolate the plants and refrain from planting or disposing of them until they can be examined. The California Department of Food and Agriculture is involved in ongoing efforts to manage the situation through inspections and control programs.