: a woolly adelgid (Adelges piceae) native to Europe that has been introduced accidentally into the U.S. where it is a serious and usually lethal pest of fir trees (such as the balsam fir and Fraser fir) see woolly adelgid
: an aphid (Adelges piceae) native to northern Europe and widespread in North America that severely damages fir (such as balsam fir) causing swollen twigs and abnormal growth and covering the stems with a dirty white flocculent encrustation
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