EGVM, or Lobesia botrana, is established in Southern Asia, Japan, Europe, North Africa, Anatolia, and South America.

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. There are three generations per season.

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.

The first discovery of the European grapevine moth in North America was in the Oakville area of California’s Napa Valley in October 2009. The first trappings yielded moths and larvae.

These discoveries prompted the California Department of Food and Agriculture and USDA Animal and Plant Health Inspection Service to initiate an aggressive statewide monitoring program to assess if the EGVM has spread to other areas of the state outside the North Coast. The trapping resulted in captures warranting quarantines in Fresno, Merced and San Joaquin counties, as well as areas near the 2009 Napa finds. One moth has been trapped in Monterey County, but no second moth that would trigger a quarantine.