You are here: Home / Research Topics / Invasive Species / Insects / Hemlock Wooly Adelgid

Hemlock Wooly Adelgid

Hemlock Wooly Adelgid Nymphs
Hemlock Wooly Adelgid Nymphs

The hemlock woolly adelgid, Adelges tsugae, a tiny sap-sucking insect related to aphids, is causing widespread death and decline of hemlock trees in the eastern United States. Hemlock trees are ecologically important, strongly influencing the types of animals, other organisms, and environmental conditions present in the areas where they grow. Hemlock woolly adelgid attacks trees of all ages and sizes and threatens to widely eliminate eastern hemlock, particularly in the southern Appalachian Mountains.

The Forest Service cooperates with numerous other Federal, State, university and private partners to better understand the hemlock woolly adelgid and its impacts and to develop management strategies for maintaining and restoring hemlock. These include biological and chemical control, silvicultural strategies, breeding for resistant hosts, and conservation of hemlock genes.

To learn more about Forest Service research on hemlock woolly adelgid in the northern United States, contact Melody Keena or Nathan Havill, Research Entomologists with the Northern Research Station. To learn more about research in the southern United States, contact Bud Mayfield, Research Entomologist with the Southern Research Station.

Find research publications about the on Treesearch. Find research publications about the hemlock woolly adelgid on Treesearch.

Related resource: Forest Health Protection Hemlock Woolly Adelgid