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adelgid US English

An insect of the family Adelgidae, which comprises sap-feeding hemipteran insects resembling aphids

woolly adelgid US English

Any of several small aphidlike insects that feed on conifers, especially hemlocks, spruces, and firs. By sucking the sap from young twigs, the insect retards or prevents tree growth and causes needles to discolor and drop prematurely