Winter Species

The species listed below are predominately detected during the winter months in New York State.  Contact your local PRISM to find out what priority species have been identified for your region. 

Hemlock wooly adelgid

(Adelges tsugae)

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.

Photo Courtesy:

Common reed

(Phragmites australis)

Phragmites is a perennial grass that can reach over 15 feet in height. It can be found in dense clonal stands made up of living stems and dead stems. Stems are hollow, usually green with yellow nodes during the growing season, and yellow when dry in the winter.

Photo credit: Ohio State Weed Lab, The Ohio State University,

License: CC By NC 3.0

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Check out some of the target species in NYS!


Contact Us:

New York Natural Heritage Program 

625 Broadway 5th Floor 

Albany, NY  12203

T: 518-402-8913


iMapInvasives is managed by the New York Natural Heritage Program (NYNHP), which is a partnership between SUNY College of Environmental Science and Forestry and the NYS Department of Environmental Conservation, with funding from the New York State Environmental Protection Fund.

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Photo by Chris Evans, University of Illinois, CC-NC 3.0