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Silver flies released to control hemlock woolly adelgid in Pennsylvania’s Allegheny National Forest

Danielle Kelley, U.S. Forest Service forest health technician, attaches a silver fly release tube to a hemlock bough in Allegheny National Forest. Inset shows close-up of silver fly release tube used on the Allegheny National Forest. (U.S. Forest Service photo by Lucas Kelley)

The U.S. Forest Service announced the release of a new biological control on the Allegheny National Forest to help combat the non-native, invasive hemlock woolly adelgid.
Hemlock woolly adelgid (Adelges tsugae) is an invasive forest insect native to Japan and the Pacific Northwest. The adelgid poses a serious threat to eastern hemlock and Carolina hemlock, which are at risk of fatal infestations since they lack natural resistance.

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