eastern webworms

Asked August 16, 2015, 9:06 PM EDT

What action could I take to treat webworms? I cut out the affected spots last year but see I have more this year.

Anoka County Minnesota

1 Response

This is probably the Fall Webworm. On a weekend road trip we noticed a huge number of webworm tents in many trees - this must be a good year for these critters!

By the time you see these structures, the caterpillars have done their work - chewing leaves in the trees. They usually don't cause long-term damage unless the tree becomes totally defoliated over a few years time. Their nests are considered unsightly, and are rather easy to cut out, but it only takes a couple of adult moths to lay enough eggs for an annual infestation of webworms.

Here is some information about possible controls:
http://cues.cfans.umn.edu/old/Web/133FallWebworm.pdf

I hope this is helpful. Please contact AaE again if you have further questions.