Vinetur reports that California agricultural authorities have expanded inspections and trapping after glassy-winged sharpshooters were found on grapevines supplied to customers in 22 counties, raising concern about the potential spread of Pierce’s disease into important wine regions. Nearly 10,000 vines from a Fresno nursery may have reached as many as 40 counties, more than 2,900 plants have already been inspected or destroyed and more than 2,700 additional traps have been deployed. Officials say there is currently no evidence that the pest has become established in commercial vineyards, but monitoring is expected to continue for at least three years. The California Department of Food and Agriculture has separately confirmed the scale of the emergency response and an additional US$820,000 in winegrower-funded support.
Pests
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California Responds to Vineyard Pest Found on Costco Grapevines
Wine Industry Advisor reports that the California Department of Food and Agriculture is working with Costco and county officials after glassy-winged sharpshooter insects were found on grapevines sold at selected Northern California Costco stores between 21 April and 19 May. The pest spreads the bacterium that causes Pierce’s disease, a fatal grapevine disease, and officials have begun containment efforts, customer notifications and inspection guidance across affected counties.