Quarantine announced to protect against spread of the pest
A quarantine has also been set over a larger, 94-square-mile area surrounding the properties where the moths were detected. A map of the quarantine area is available online at http://pi.cdfa.ca.gov/pqm/manual/pdf/maps/3437EGVMSantaClara.pdf. The quarantine primarily affects grape farmers, transporters, processors and others who handle agricultural commodities that could harbor or spread the pest. Agricultural officials have already begun visiting affected growers and businesses in the region to ensure that they understand and comply with the quarantine restrictions.
“This pest is capable of rapidly infesting entire vineyards and rendering their grapes unfit for consumption, so we are working quickly to get ahead of the infestation by removing the grape clusters that the moth needs to feed and breed on,” said CDFA Secretary
Crews will remove grapes from backyard grapevines within 400 meters of where EGVM was found. Fruit removal will help to eradicate EGVM on the properties and greatly reduce the risk of spread to commercial vineyards.
Fruit removal was recommended by a Technical Working Group (TWG) appointed by the United States Department of Agriculture, made up of scientists and specialists working with this type of pest.
Approximately 20 properties are within the area designated for fruit removal. Some contain grapevines, which are the only EGVM host plant targeted for fruit removal. Fruit removal activities are scheduled to begin this week. Residents will be notified in advance to make arrangements for the crews to access their properties. CDFA and local agricultural authorities are also working with commercial grape growers, haulers and handlers in the area to safeguard their crops from the pest.
Portions of nine counties are under quarantine for the European grapevine moth:
The EGVM larvae, not the adult moths, are responsible for the damage to grapes. Larvae that emerge early in the spring feed on grape bud clusters or flowers and spin webbing around them before pupating inside the web or under a rolled leaf. If heavy flower damage occurs during this first generation, the affected flowers will fail to develop and yield will be reduced. Second-generation larvae chew into the grapes to feed before pupating in the clusters or in leaves. Larvae of the third generation — the most damaging — feed on multiple ripening grapes and expose them to further damage from fungal development and rot. These larvae overwinter as pupae in protected areas such as under bark, and emerge as adults the following spring.
California Department of Food and Agriculture Office of Public Affairs
1220 N St., Ste. 214, Sacramento, CA 95814