Fall Webworms on Oak Trees in Texas

Identification

Webs on branch tips with caterpillars dangling on silk in late summer = fall webworms (Hyphantria cunea). They prefer pecan, oak, mulberry, and other hardwoods.

Control

1. Early detection: Prune out webs when small (pole pruner).
2. Bt (Bacillus thuringiensis): Spray foliage when caterpillars are young (<1 inch).
3. Insecticides: Spinosad, carbaryl, or pyrethroids for larger infestations.

Natural Cycle

Outbreaks are cyclical. Parasites and predators usually crash populations within 1–2 years. Healthy oaks tolerate defoliation well.

Reference

Texas A&M: Fall Webworm Control.