Grape plants sold at several Costco locations in California may pose a serious threat to California vineyards and agriculture after inspectors discovered an invasive insect known for spreading a deadly grapevine disease.
The San Joaquin County Agricultural Commissioner’s Office said inspectors discovered the glassy-winged sharpshooter on grape plants sold at Costco stores in Stockton, Lodi, Manteca and Tracy. The plants were supplied by a wholesale nursery in Fresno County.
The insect spreads the bacterium that causes Pierce’s disease, which kills grapevines and can also damage almond, citrus and ornamental plants. Officials said the pest feeds on more than 250 plant species and poses a significant threat to California’s grape industry, vineyards and home gardens.…