Black walnut, willow, crab apple and other fruit trees, hickory and sycamore are frequently infested with fall webworm.
Tent caterpillars make their webs at tree crotches and are spring pests.
The fall webworm adult is an attractive white tiger moth with black markings. The dark markings of spots and stripes may be few or extensive. Adults emerge from pupae in leaf litter during May, but the first generation goes unnoticed. A second generation, which emerges in late July or August, is more likely to be pestiferous. Females lay light-yellow eggs in egg masses numbering several hundred eggs.