Fall Webworms

Subject: What is it?
Location: Jackson, Wyoming
June 19, 2016 4:57 pm
Can you identify this?
Signature: Don’t care

Fall Webworms
Fall Webworms

These are Fall Webworms, Hyphantria cunea.  According to BugGuide:  “Weblike tents in branch tips where clusters of caterpillars strip foliage (by contrast, eastern tent caterpillar nests are built in tree crotches)” and “Larvae feed on foliage throughout their development, and secrete silk which they spin into small webs. As they grow, they enlarge the webs, which can sometimes enclose the entire tree. Even severe infestations have little impact on trees because the damage occurs near the end of the annual growing season. Except in the case of ornamental trees, control is seldom necessary because the damage is generally of aesthetic rather than economic importance.”  BugGuide also notes:  “About 120 species of hardwood trees have been recorded as larval hosts in the north, common hosts include alder, apple, ash, birch, Box-Elder (Acer negundo), cherry, elm, mulberry, poplar, willow in the south, common hosts include ash, hickory, maple, mulberry, oak, pecan, poplar, redbud, sweetgum, walnut, willow; preferences for different host plant species appear to be regional and seasonal.”

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