Common Insect & Mite: Tent caterpillars

Photo by: S.J. Collman
Use IPM (Integrated Pest Management) for successful plant problem management.

Biology
The most common tent caterpillar in home landscapes is the western tent caterpillar. It typically has a dark body with white and orange or yellow markings and a bluish dashed line down the center of the back. Long whitish or yellowish hairs are found along the length of the body. Adult moths lay eggs in a foamlike mass around current-year twigs, where the caterpillars overwinter as tiny larvae inside their eggshells. In spring and early summer, characteristic tents are made on the tips of branches. Young caterpillars typically feed in large groups in the protection of the nests. Older caterpillars feed in small groups or as individuals. They can partially or completely defoliate trees, causing some loss of vigor. Badly weakened trees may be killed, but damage is rarely this severe. The western tent caterpillar is famous for 2- to 3-year epidemic cycles on many kinds of trees. They almost disappear for several years following outbreaks.

Management Options

Select Non-chemical Management Options as Your First Choice!!
Revision Date:4/30/2013
Pesticides are generally not recommended. If you choose to make an application, make certain that the pesticide applied is registered for the host and effective against the pest. Carefully read and follow label instructions. Homeowners should not make foliar applications to trees over 10 ft tall. Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.

Hortsense web site created by Carrie Foss, Pesticide Education, and Art Antonelli, Extension Entomology, WSU Puyallup
Pesticide information review provided by Catherine Daniels, Washington State Pest Management Resource Service
Database programs developed for Hortsense by Kathleen Duncan, Computer Resources, WSU Pullman
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