This caterpillar is a defoliator of oaks and many other hardwoods throughout the United States. Infestations have been most common in the Appalachian and Ozark Mountains and their foothills.
Damage is more severe among shade and ornamental trees than forest stands.
Identifying the Insect. The larvae are yellowish and black striped, and moderately covered with fine, white hairs. The head is jet black. When disturbed, the larvae lift their heads and tails in a distinctive U-shape. This is a defensive measure to prevent parasitism by various wasps and flies.