If you purchased grapevines or blueberries from Costco locations in California, Oregon, or Nevada since April 21, 2026, please contact the Modoc County Agriculture Commissioner’s Office at 530-233-6401 or 335 N. Main Street, Alturas, California or your local Ag Commissioner.
What To Do If You Purchased a Plant
If you purchased a grapevine from Costco in an affected county between April 21 and May 19, take the following steps:
Isolate the Plant
- Keep the plant in its original pot or container and away from other plants.
- Do not put the plant in the ground if you have not already done so.
- If possible, place the plant inside two trash bags, one inside the other, and seal them closed.
- Do not return, transport or relocate the plant.
- Do not place the plant in the trash or compost bin.
Contact Your Local County Agricultural Commissioner’s Office Right Away
Find your County Agricultural Commissioner
- An agricultural inspector will come to examine the plant and nearby host plants.
- If inspectors find GWSS on the grapevine, they will safely remove and dispose of the plant.
- GWSS monitoring traps may also be placed on or near the property.
