woolly adelgid
noun
woolly adel·gid
-ə-ˈdel-jəd
: either of two aphids (genus Adelges) with a white woolly coating that have been accidentally introduced into North America:
a
: one (A. piceae) native to Europe that is a serious pest of fir trees
b
: one (A. tsugae) native to Asia that is a serious pest of hemlocks
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Merriam-Webster unabridged
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