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Gypsy Moth (Lymantria dispar)
Gypsy moth caterpillars are one of the most destructive forest pests in North America, capable of completely defoliating oak and other hardwood trees across millions of acres during outbreak years. Repeated defoliation over two to three consecutive years can kill even mature, otherwise healthy trees. The egg masses, which look like tan, feltlike patches, can be transported on vehicles and outdoor furniture, aiding the spread of this invasive species. Aerial and ground applications of Bacillus thuringiensis (Bt) during early larval stages provide effective and environmentally targeted control.