Elongate Hemlock Scale

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 NH Pest Alert and Forest Service Pest Alert Wallet Card Scales on Hemlocks First Outbreak in NH The announcement A slideshow EHS and Other Exotic Insects Susceptibility of Landscape Trees to Invasive Insects Brochure Poster Help Protect Our Trees -- Exotic Species Fact Sheet Important EHS Websites NH Division of Forests and Lands Maine Forest Service USDA Forest Service, Northeastern Area

Treatment status (includes hemlock woolly adelgid)   EHS Distribution in the US

Cooperating agencies:

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