Adelges tsugae
, the hemlock woolly adelgid, is a fluid-feeding insect
that feeds on hemlock trees throu
ghout eastern North America,
including Pennsylvania. The egg sacs of
these insects look like the tips
of cotton swabs clinging to the undersides of hemlock branches.
Hemlock woolly adelgid was introduced from Asia into the Pacific
Northwest in 1924. It was probably introduced into the northeastern US
in the 1950's, and it was first discovered in Pennsylvania in 1967

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