Purchased a Grapevine or Desert Willow at Costco? Important GWSS Information

Last updated: July 7, 2026

The California Department of Food and Agriculture (CDFA) is responding after invasive glassy-winged sharpshooter (GWSS) insects were found on grapevines sold at select Costco locations in Northern California between April 21 and May 19 and desert willows sold at Costco locations between June 24 and July 3.

If you purchased a grapevine or desert willow from Costco in an affected county during this, contact your local County Agricultural Commissioner’s Office right away.

GWSS is an invasive insect pest that spreads the bacterium that causes Pierce’s disease, a fatal grapevine disease that threatens California vineyards. The pest can also damage citrus trees, landscape plants and other crops. Early detection and rapid response are critical to preventing the pest from spreading further.

News release: CDFA Urges Immediate Reporting of Grapevines Purchased at Costco   (Español)

What To Do If You Bought a Plant

Please follow the steps below if you bought:

Isolate the Plant

Contact Your Local County Agricultural Commissioner’s Office Right Away

Find your County Agricultural Commissioner

Desert Willows Sold June 24 – July 3 at Costco Stores by County

Please contact your local agriculture department if you bought a desert willow at a county listed below. Contact the agriculture department in the county where the plant is now located, even if you bought it in a different county.

As of 7/7/2026

Grapevines Sold April 21 – May 21 at Costco Stores By County

Please contact your local agriculture department if you bought a grapevine at a county listed below. Contact the agriculture department in the county where the plant is now located, even if you bought it in a different county.

As of 6/5/2026 at 5:40 p.m.

Response and Containment Efforts

The California Department of Food and Agriculture and county agricultural commissioners continue to respond to this situation. Finding and quickly removing infested plants is the best way to prevent GWSS from spreading and protect California agriculture.

Response activities include:

Outreach Material

For editable design files, please contact PDCP: email or call (916) 900-5024

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gwss costco - isolate the plant protocol

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gwss costco - how to contact local county agriculture commissioner

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gwss costco - impacted counties

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