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We have thousands of little green worms/caterpillars hanging from webs in our trees, eating the leaves til they are bare. What can we do to get rid of them?

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A

I cannot positively identify which caterpillar you are asking about, because I don't have enough information. But I suspect you are asking about the oak cankerworm, which is a looper type of caterpillar that hangs from silken threads and eats gambel oak.

Read about this insect and how to control it in the USU Extension publication on Gambel Oak, at http://extension.usu.edu/files/publications/publication/HG-514.pdf

There are other caterpillars that feed and nest in trees. You can read about them at the Colorado State University website:

http://www.ext.colostate.edu/pubs/insect/05583.pdf

Posted on 17 May 2007

Maggie Wolf
Horticulture Agent, Salt Lake County

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