Grapevines and Fruit Trees from Costco Possibly Infested with Glassy-winged Sharpshooter

Alerts have been issued that grapevines and fruit trees sold at Costco Wholesale locations in California may be infested with the glassy-winged sharpshooter (GWSS), an invasive insect pest that poses a serious threat to California’s vineyards.

Costco is directly contacting members who purchased plants within the timeframe and directing them to county ag commissioners.

GWSS can spread Pierce’s disease, a bacterial infection that is often fatal to grapevines and can significantly impact vineyard production. GWSS can damage almond, citrus and ornamental plants. Early detection and containment are critical to protecting California’s agricultural and viticultural resources.

If you purchased a grapevine, citrus tree or other fruit tree at Costco locations during April or May, you should: 

• Contact your local ag commissioner for inspection.
• Keep the plant isolated in its original pot or container.
• Do not plant the grapevine or tree if you have not already done so.
• If possible, place the plant(s) in two secured trash bags, one inside the other, and seal them closed.
• Do not attempt to return, transport, or relocate the plant.
• Do not place the plant in the trash or a compost bin.

For more information about GWSS and Pierce’s disease, visit the California Department of Food and Agriculture’s Pierce’s Disease Control Program web page.