Fact Sheets no. Gypsy moth is one of the most destructive defoliators of trees and shrubs in the United States. Oaks are the preferred hosts, but gypsy moths also eat aspen, willow, apple and almost 500 other trees, shrubs and vines.
Severe defoliation reduces tree vigor, allowing for secondary infection and possible death.
Females lay their egg masses on outdoor objects such as lawn furniture and vehicles and can be transported quickly over long distances. Eradication of discovered gypsy moth populations in Colorado may be possible through the integrated use of chemical and biological controls. In 1869, gypsy moth was introduced into the Boston area from France for experimental cross-breeding with silkworms. Some escaped and became established on the surrounding vegetation. Without their natural enemies to keep them in check, they soon became a major pest in the northeastern United States.