In some years, a second brood of the orange race may possibly occur in some areas. Importance, Damage, and Control Outbreak populations of fall webworm can completely defoliate host trees. Healthy hardwoods usually survive and recover without permanent injury. However, several consecutive defoliations can cause dieback in the crown, and may contribute to the death of weak, declining trees. The webworm is not usually a serious pest in natural forest stands.
Infestations are of greatest concern on shade, ornamental, and urban forest trees.
Here, loss of foliage and unsightly webs seriously reduce the aesthetic and environmental values of the trees. In this circumstance, control of the webworm may be desirable. Control recommendations are available from appropriate Extension Service personnel. The fall webworm has many natural enemies, i.e., predators, parasites, and disease. These play an important part in maintaining webworm populations at low levels during many years.