Forest Pests: Insects, Diseases & Other Damage Agents

Fall Webworm

Solomon, J.D.; Leininger, T.D.; Wilson, A.D.; Anderson, R.L.; Thompson, L.C.; McCracken, F.I. 1993. Ash pests: A guide to major insects, diseases, air pollution injury and chemical injury. Gen. Tech. Rep. SO-96. New Orleans, LA: U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station. 45 p.

Pest. - Fall webworm, Hyphantria cunea (Drury); mature larvae are 25 mm long, pale yellow to greenish and with hairy, red or black heads; occurs throughout the United States and southern Canada; produces one to four generations per year.

Injury. - Caterpillars make webbed nests around leaves at branch ends, living and feeding in groups inside the nests; populations and webbed nests are most abundant in late summer and fall.

Prevention and Control. - Natural enemies are usually effective; webbed nests can be pruned from small trees; chemical or biological controls may be needed.

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