How to Manage Pests

Pests in Gardens and Landscapes

Fall webworm—Hyphantria cunea

Larvae of the fall webworm are pale brown or gray caterpillars with long white hairs arising from black and orange spots. There is only one generation per year.

Damage

Larvae feed in webbed colonies on ends of branches. Caterpillars are found eating foliage between the leaf veins and forming silken tents on host trees. Damage occurs in mid to late summer.

Solutions

On small trees, cut out and destroy infested twigs. If necessary, Bacillus thuringiensis or spinosad can be applied to individual trees with a high-pressure spray when evidence of caterpillars is first observed.

Adult fall webworm
Adult fall webworm
Larvae and damage
Larvae and damage
Silken tents on host
Silken tents on host

Statewide IPM Program, Agriculture and Natural Resources, University of California
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