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U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Invasive Forest Insects

Non-native invasive insects have had a significant impact on the forests of North America. The ecological functionality of some host trees has been severely reduced by species such as the emerald ash borer and hemlock woolly adelgid. These insects have impacted both urban and forest host trees, and the Forest Service and state partners work closely with APHIS to detect and manage these invasive pests.

Hemlock woolly adelgid infestation

Hemlock woolly adelgid infestation. Photo by Chris Evans, University of Illinois, Bugwood.org

Spotlights


Hemlock Woolly Adelgid

Photo by Michael Montgomery, USDA Forest Service, Bugwood.org

Hemlock Woolly Adelgid

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Emerald Ash Borer

Photo by Pennsylvania Department of Conservation and Natural Resources, Bugwood.org

Emerald Ash Borer

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Asian Longhorned Beetle

Photo by Kenneth R. Law, USDA APHIS PPQ, Bugwood.org

Asian Longhorned Beetle

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