Virginia Department
of Forestry

Hemlock wooly adelgid (HWA) is a small insect that causes huge problems. Learn more about this insect in this publication including information on how to identify it, its lifecycle, and distribution as well as the damage it causes and tactics for managing it. This Southern Region Extension Forestry publication provides additional information about the biology and management of HWA.

Forestry topic information sheet discusses treatment options to protect hemlock trees from the damaging hemlock woolly adelgid.

Webinar about HWA biology and management in the Southeastern U.S.

Video on how to treat hemlock trees using the soil drench method.

Document provides guidance through the application process for the Hemlock Woolly Adelgid Treatment Cost-Share Program offering financial assistance for treating hemlock trees.

Application form to be completed to apply for Hemlock Woolly Adelgid Treatment Cost-Share Program.

A non-native invasive insect, the hemlock woolly adelgid (HWA), threatens the ability of natural resource managers to maintain eastern and Carolina hemlocks as critical components of unique forest ecosystems in eastern North America. Although substantial progress has been made in both chemical and biological control of HWA, neither of these tactics applied alone are expected to provide adequate control of HWA throughout its introduced range. This guide presents a methodological strategy for integrating biological and chemical control together in the same forest stands.

Hemlock woolly adelgid (HWA) (Adelges tsugae) is killing hemlock trees in the eastern U.S. This invasive insect is native to Japan and has been in the eastern U.S. since the 1950’s. HWA feed by sucking fluids from hemlock twigs just at the base of the needles, depleting the tree of needed energy reserves. Large swaths of hemlock forests have been decimated by HWA, and millions of hemlocks have died. This publication provides information about optimized dosage for HWA control in hemlock trees