Lymantria Dispar (formerly gypsy moth)

Outbreaks of Lymantria dispar are not frequent but are unpleasant to live with when they do occur. Learn more about why populations grow and collapse and how you can deal with their impact.

Lymantria dispar, formerly gypsy moth, caterpillars feed on the leaves of oaks, aspen, crabapple and many other types of trees. Outbreaks of Lymantria dispar are not frequent but when they occur, it can be unpleasant to live, work or recreate in an affected area. Lymantria dispar caterpillars can be so abundant that many trees will be completely defoliated by early July. Several areas in Michigan experienced Lymantria dispar outbreaks during 2019, and populations may be high in some areas again during summer 2020. The links below provide information about Lymantria dispar, how it affects your trees and options for dealing with this invasive pest.