Mendocino County has not confirmed any glassy-winged sharpshooter detections on local grapevines as of June 8, 2026. - Tests on samples from Ukiah Costco have been negative for GWSS, though some results are pending.
- The pest has been found in neighboring counties, prompting emergency measures. - Residents who bought grapevines from Ukiah Costco between April 24 and May 19 are urged to isolate plants and contact officials.
Officials continue heightened surveillance and urge cooperation to protect the wine industry.