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. Photo by Chris Evans, University of Illinois, Bugwood.org

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