Forest tent caterpillars in Wisconsin
The forest tent caterpillar is one of the major defoliating caterpillars in Wisconsin. It is distributed throughout the United States and Canada wherever hardwood trees grow. The populations of forest tent caterpillars periodically erupt, and cause heavy defoliation on broad-leaved trees and shrubs in Northern Wisconsin. During an outbreak, many caterpillars are found not only on trees, but also crawling on roads and buildings. Some people mistakenly call forest tent caterpillars “army worms” because when they migrate on the ground to find more food, they look like marching soldiers.
An outbreak of the forest tent caterpillar began in 1999 in northern Wisconsin, and the defoliation by the caterpillar was seen throughout much of northern Wisconsin in 2001.
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