Gypsy Moth CaterpillarGypsy Moth in Wisconsin
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Gypsy moth hotline:
1-800-642-MOTH

For more information about the content on this website, please contact Andrea Diss-Torrance.

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UW-Extension

Each year, gypsy moth caterpillars defoliate thousands of acres of hardwood forests throughout northeastern United States, including Wisconsin. This site offers tips on how to limit damage to your trees and available assistance programs.

May  

 

Caterpillars begin to hatch

Caterpillars start hatching in early to mid-May. Sticky barrier bands should be up by the first week of May. Directions on how to make a sticky barrier band.

Aerial spray treatments to suppress outbreaks or slow the spread of gypsy moth occur in mid to late May when caterpillars are very small and vulnerable to the bacterial insecticide Bacillus thuringiensis kurstaki (Btk).

  

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