Glassy-Winged Sharpshooter Found On Costco Grapevines — Buyers Urged Not To Plant

California agricultural officials have detected the invasive glassy-winged sharpshooter on grapevines sold at multiple Costco stores and are warning buyers not to plant the affected vines. The insect can carry Pierce's disease, a bacterial infection that kills grapevines and threatens vineyards across the state.

The Contra Costa County Department of Agriculture says the pest was found on grapevines sold at five Costco locations — including Concord, Danville and Brentwood — and at other Northern California outlets. Officials traced the shipments to Burchell Nursery in Fresno County.

"The glassy-winged sharpshooter poses an immediate and serious threat to grapevines and agricultural landscapes throughout Contra Costa County," said Contra Costa County Agricultural Commissioner Matt Slattengren.

What Buyers Should Do

If you purchased one of these grapevines on or after April 21, follow these steps immediately:

• Keep the plant in its original pot or container — do not plant it in the ground.
• Isolate the plant away from other vegetation and edible gardens.
• Do not move the plant between properties or counties, and do not dispose of it in regular trash.
• Contact your county agricultural department or the Contra Costa County Department of Agriculture for guidance and next steps.

Why This Matters

California classifies the glassy-winged sharpshooter as a regulated pest because it spreads Pierce's disease, which can rapidly kill grapevines and inflict severe economic damage on vineyards. The state’s wine industry generates billions of dollars annually, making containment of this pest a high priority.

Invasive pests are not limited to commercial vineyards — a single infected plant moved from a patio or nursery into a backyard or neighborhood planting can complicate detection and containment efforts. State and county agencies are coordinating to identify potentially infested stock and prevent the pest from becoming established in key vineyard regions.

Preventive Tips For Gardeners

Inspect new plants before introducing them near ornamentals or edible gardens. Look for unusual insects, leaf damage, or other signs of stress. When possible, quarantine new arrivals for a short period, monitor plants regularly, and prioritize nonchemical control methods. Keeping weeds and debris under control also reduces pest habitat.

For further assistance, contact your local county agricultural office. If you believe you have an affected plant from the identified Costco stores, leave it where it is and reach out to officials for instructions.