Author: Molly Darr

PhD, Post-Doctoral Associate, Forest Health and Invasive Species, Forestry and Environmental Conservation Department

Hemlock woolly adelgid infestation on the underside on a hemlock twig

Hemlock Woolly Adelgid: Biology and Management

by Molly Darr, David R. Coyle and LayLa W. Burgess
September 2, 2019November 4, 2026

Hemlock woolly adelgid (Adelges tsugae, HWA) is an aphid-like invasive pest of hemlock trees in eastern North America. The HWA is native to all hemlock species in western North America and Asia, and hemlock trees…