Harnessing the urgency of the situation, Dave Whitmer, Napa County’s Agricultural Commissioner, and Monica Cooper, Napa County’s Farm Advisor, along with Napa Valley Vintners, Napa Valley Grapegrowers, Napa County’s Farm Bureau and local environmental groups, coordinated a county-wide effort to control the moth during the 2010 growing season that included over 5,000 traps, a quarantine during harvest, spray applications of ovicide and larvicide, and pheromone mating disruption. As a result of these efforts, vineyard crop damage was greatly reduced in 2010, turning what was largely seen as a potentially catastrophic threat to Napa vineyards into a success story in pest and environmental management.
While significant progress was made in 2010 in quarantining and reducing EGVM populations, experts agree that continued vigilance in combating the moth in 2011 is key to completely eradicating the moth in the Napa Valley.
For the 2011 growing season, it is recommended that all grape growers within 500 meters of a moth trapped in 2010 treat the first two generations with ovicide and/or larvicide and put up Isomate pheromone mating disruption twist-ties in their vineyards. The county will again set traps throughout the Napa Valley to asses the location and volume of the moths throughout the season and quarantines during harvest are recommended.
Home winemakers also play an important role in eradicating the moth and complying with EGVM standards. For example, as EGVM can be spread via green waste, any residue from home winemaking should be double bagged and placed in a trash can and should not be added to compost piles. To comply with the quarantine, home winemakers who use custom grape facilities for their wines should use facilities within their quarantine area. More information for Napa homeowners can be found here.
Questions or want to be on the County’s mailing list for further updates? Contact Napa County EGVM Grower Liaison Martin Mochizuki.
(Photo Credit: Kick The Moth Out! Facebook Page)