Tower Quest

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Hemlock Woolly Adelgid & Elongate Hemlock Scale


Hemlock Woolly Adelgid is a small wingless insect which has piercing mouthparts to feed in the xylem of the small hemlock twigs.  This insect is originally from Asia and was first discovered in Portsmouth in 2000.  Elongate Hemlock Scale is an exotic scale insect that prefers hemlock, spruce and fir but will also feed on cedar, pine, and yew. This insect was introduce to New York in 1908 from Japan and has since spread north to Maine and south to North Carolina. Scale can also be found on trees infested with adelgid. Scale populations build slowly on healthy trees but more quickly on trees stressed by adelgid, drought, or other factors. Left untreated these pests can kill trees in NH within 10 years.

NEW! Managing Hemlock in Northern New England Forests

Check Out this great NEW Documentary

Please follow the following links to see a current maps of HWA and EHS in NH, the quarantine on hemlock material, and other related information.

Hemlock Woolly Adelgid Factsheet                     Elongate Hemlock Scale Factsheet

Hemlock Woolly Adelgid Action Plan   

Hemlock Woolly Adelgid Quarantine

USDA Forest Service HWA webpage                                          

UNH Cooperative Extension HWA webpage        UNH Cooperative Extension EHS webpage

Map of Towns with HWA Detections                 Map of Towns with EHS Detections

Recent HWA Survey Map                                    Recent EHS Survey Map