A black or gray aphid with long legs. This is a common pest of eastern white pine. Severe infestations reduce the growth and may even kill small trees. Colonies occur most commonly on twigs and stems where the bark may be killed in patches. Needles and twigs are sometimes completely covered with sooty mold. Eggs, which are laid in lines on the needles, may hatch when infested white pines are brought indoors for use as Christmas trees. Spray treatments are effective.