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Pine Bark Adelgid

Pine bark adelgids are small, dark, aphid-like insects that are covered with a cottony wax secretion. They occur on the smooth bark of trunks and limbs; heavy infestations look like a covering of whitewash. While some can be found at the bases of needles or on terminal buds, these insects feed only on bark. The adelgids reproduce repeatedly and there can be as many as five generations in a year. Trees in home landscapes, parks, and recreational areas can become heavily infested by this insect but there appears to be no permanent damage to healthy trees. Use a dormant oil in the spring before new growth develops.  A strong stream of water also can be used to wash many adelgids from small trees.