Fall Webworm

Fall Webworm Control

Hyphantria cunea

This native to North America is found throughout the United States, Canada and Mexico. They cause the most damage to shade trees and can cause damage in pear and apple trees. The larvae spin large webs that can enclose entire branches allowing them to feed on the leaves and any captured fruit.

Fall Webworm are aptly named because they begin forming their webs in August. This is one way to differentiate between the Fall Webworm and the Tent Caterpillar – Tent Caterpillars appear in the spring.

The webs are very protective of the larvae, but sprays of Bacillus thurengiensis kurstaki. and Spinosad on the leaves that are encased can provide some control.