In mid-October 2009, European Grapevine adult moths and multiple larvae were detected in a vineyard in the Oakville area of Napa County. This was the first known find of this pest in North America.
Approximately 40,000 traps were placed throughout California in 2010 to determine if EGVM was present elsewhere in the state. As a result, European Grapevine Moth was found in Fresno, Mendocino, Merced, Monterey, Napa, San Joaquin, Santa Clara, Santa Cruz, Solano, and Sonoma counties. Trapping in 2011 detected EGVM in Nevada County.
Two moths found within three miles of each other within one lifecycle triggered a quarantine established by USDA and CDFA. Originally, five mile buffers were drawn around each of the find sites. This buffer was reduced to three miles in 2012.
Fresno, Mendocino, Merced, and San Joaquin counties were released from European Grapevine Moth quarantine regulations in February 2012. The EGVM quarantine was lifted from Nevada, Santa Clara, and Santa Cruz counties in December 2012. At that same time the quarantine areas were significantly reduced in both Solano and Sonoma counties. The remaining quarantine area in Solano County was released from quarantine in 2014. Napa and Sonoma counties remained under EGVM quarantine regulation until August 2016.