Protecting trees and forests

Elongate Hemlock Scale

Tip blight on eastern hemlocks

A disease on natural regeneration. May be mistaken for EHS.

Elongate hemlock scale (EHS) is native to Japan. It was first observed in Queens, NY in 1908. Today it is found in thirteen states, including New Hampshire. Like hemlock woolly adelgid, EHS feeds on the underside of the hemlock needle, draining tree fluids with its piercing and sucking mouth parts. Trees often die within 10 years.

Outbreaks of elongate hemlock scale often intensify following infestations of hemlock woolly adelgid, drought, or other stresses that weaken trees. Maintaining trees in a healthy condition discourages buildup of this pest.

The Basics and What to Do

EHS and Other Exotic Insects

Important EHS Websites

Towns with Infestations - Alphabetical List

Towns with Infestations - Map by Year


U.S. Distribution of Elongate Hemlock Scale