Orchards may be invaded by young larvae ballooning long distances on silk threads. Photo by G. Krawczyk.
Egg masses deposited in July on trees, rocks, and other surfaces hatch the following year in April and May. Orchards may be invaded by young larvae ballooning long distances on silk threads. Larvae pupate in mid- to late June and adults emerge in July. Females cannot fly.
If gypsy moth larvae are found, they may be removed by hand and destroyed, or killed with an insecticide. Bacillus thuringiensis-based compounds are effective insecticides with low toxicity to other animals.