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Welcome to iMapInvasives, New York's Online Invasive Species Database and Mapping System!
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"On a global basis...the two great destroyers of biodiversity are, first, habitat destruction, and second, invasion by exotic species..."
 E.O. Wilson (Strangers in Paradise, 1997)   
SPECIES OF THE MONTH: Hemlock Woolly Adelgid
The hemlock woolly adelgid (HWA, Adelges tsugae) is an aphid‐like,  invasive insect that poses a serious threat to forest and ornamental hemlock trees (Tsuga spp.) in eastern North America. HWA are most  easily recognized by the white “woolly” masses of wax produced by females in late winter, found at the base of the needles on the underside of branches 
For additional information please visit NYS Hemlock Initiative
                            Hemlock Woolly Adelgid                          
photo of HWA by Mark Whitmore
Photo from: Mark Whitmore

The fuzzy white masses are readily visible at the base of hemlock needles attached to twigs. The best time for HWA detection is between February and May, but the woolly masses can persist throughout the year.  Start with hemlock branches within safe arms reach, and examine the underside of the branch towards the end.

Photo from: by Bruce Watt 

Please follow the link for additional information on Reporting HWA in iMapInvasives

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