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.
EHS & Other Exotic Insects
- Susceptibility of Landscape Trees to Invasive Insects
- Help Protect Our Trees -- Exotic Species Fact Sheet