This insect is not native to North America. Gypsy moth was accidentally introduced into Massachusetts in 1869 and has been slowly spreading through the northeastern U.S. Michigan is currently the westernmost state infested by gypsy moth. The first gypsy moth outbreaks in Michigan occurred in the mid-1980's in the central part of Lower Michigan, around Midland and Clare Counties. Since then, much of northern Lower Michigan has experienced a gypsy moth outbreak. High populations are expected to occur in areas of southwest and southeastern Michigan during the next few years.
Gypsy moth can be an annoying pest in urban forests, especially during the caterpillar stage.
When gypsy moth populations reach outbreak levels, shade trees may be heavily defoliated. These effects can be upsetting for residents, especially for people who have not experienced a gypsy moth outbreak before. This fact sheet was produced to provide answers to some questions that are frequently asked by urban dwellers. Gypsy moth caterpillars have pairs of red and blue spots along their back, long dark hairs and are present from May until early July. The caterpillars spin reddish-brown cocoons in July and pupate for one to two weeks.