Hemlock Woolly Adelgid (HWA) is an aphid-like insect native to Asia. It was first recognized in the Eastern U.S. in Virginia in 1950’s, and reached New York in the 1980
The HWA is spread by the wind, by birds, or by humans or other animals- infestations do not spread by flying HWA. HWA produce two generations a year, and all are female and reproduce asexually. The HWA is active during the winter, which allows it to avoid predators (which are generally active during the summer) and to take advantage of the hemlock’s increased energy intake during the winter.
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