Insects and Spiders - native

Fall Webworm Moth (Hyphantria cunea) on Sep 1, 2024

Submitter does not have a specimen

Description of specimen

The three nests look like a very dense cobweb that overtakes a small area of a tree branch. You should be able to see the three nest areas in the attached photo.

Commentary

Thank you for your report! That is the native Fall Webworm, Hyphantria cunea, not Spongy Moth (we don't use the other name anymore). The webs are unattractive, but the trees usually recover.

Tom Valente
Sept. 3, 2024, 7:44 a.m.

Remedy

Information on biology and management in Oregon from the Oregon Dept. of Forestry

Resources

Fall Webworm Moth information on iNaturalist

Location

I am able to see three Gypsy Moth nests from my back deck and back yard. They are all in the same tree and there may be more I cannot see from my vantage point. The tree is located in a wetlands area beyond my property line and the nests are much higher than I can reach myself. Tree professionals should be able to reach the nests with the proper equipment.

Expert Reviewer

Tom Valente
Oregon Department of Agriculture

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