Understanding the Western Grapeleaf Skeletonizer: Management in Commercial Vineyards

Grapes have been cultivated in Arizona since very early times, starting with native varieties, followed by European introductions by Spanish colonists around the 16th century. Today, grapes are widely cultivated in three American Viticultural Areas as well as many home gardens in Arizona. An important pest affecting grapevines in Arizona is the western grapeleaf skeletonizer (WGLS). The pest is native to the southwestern US, including central California, Arizona, New Mexico, Texas, Utah, and Colorado and extending to northern Mexico.