Robert L. Anderson, USDA Forest Service, Bugwood.org
Hemlock Woolly Adelgid
Adelges tsugae

Hemlock Woolly Adelgid (Adelges tsugae) is an insect pest of hemlock trees. It is a native of Asia and was first detected in the East Coast in the 1950's.

Though introduced into the Western U.S. in the 1920's it is not considered a pest there. It is killing hemlock in the east and has spread throughout the Appalachian Mountain areas and into the Midwest.

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