The gypsy moth is a nonnative invasive insect that was introduced into Massachusetts in the late 1860s. It is now established in all or parts of 19 Eastern States and the District of Columbia, or roughly one-third of its potential habitat in the United States. Once gypsy moth infests an area, outbreaks appear from time to time. The gypsy moth caterpillar eats tree leaves, which reduces tree growth and increases dieback, eventually killing the tree. Gypsy moth has defoliated trees on more than 92 million acres since 1924.
Skip to Main Content