WSU Extension

Hortsense

Common Insects, Mites & Vertebrates
 
Aphids 
Asian lady beetle 
Bark beetles 
Brown marmorated stink bug 
Brown soft scale 
California gallfly 
Conifer aphids 
Cottony camellia scale 
Cutworms and loopers 
Deer damage 
Earwigs 
Eriophyid mites 
Exotic longhorned beetles 
Fall webworm 
Inchworms 
Leafhoppers 
Leafminers 
Leafrollers 
Lecanium scale 
Oystershell scale 
Pamphilid sawflies 
Pear slug 
Root weevils 
Sapsucker damage 
Shothole borer 
Skeletonizers 
Slugs 
Sowbugs, pillbugs, and millipedes 
Spider mites 
Spotted wing Drosophila (SWD) 
Tent caterpillars 
Voles 



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Caption: Fall webworm
Photo by: S.J. Collman
  
Common Insects, Mites & Vertebrates : Fall webworm
(revision date: 4/30/2013)


Biology
Fall webworm caterpillars feed on the foliage of a variety of trees and shrubs. Conspicuously hairy, they appear rusty tan with a dark, almost black, body color. Some populations have a lighter tan color phase. Large tents of this late-season pest become noticeable in late summer and early fall. Caterpillars are particularly fond of alder, cottonwood, walnut, and apple. They sometimes feed on apple fruit as well as foliage.
Management Options

Non-Chemical Management
  • Prune out and destroy caterpillar tents.
Select non-chemical management options as your first choice!

Chemical Management

Pesticide applications 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. 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.

Images

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Caption: Fall webworm
Photo by: S.J. Collman
Caption: Fall webworm tent on apple
Photo by: R.S. Byther