The gypsy moth is a non-native pest that feeds on leaves and needles of over 300 different trees in the buckeye state. The feeding injury occurs in the spring and early summer when populations are present. The early season feeding, when heavy, causes the plants to push new leaves that ultimately are the food-factories for the rest of the year. Healthy deciduous trees can usually recover as long as there isn't repeat defoliation year after year. Evergreens can die in a single season.