Giant bark aphids (Longistigma caryae) scare many unsuspecting gardeners and homeowners. They do not bite or sting but they can, upon occasion, injure the plant they are on. Some will have wings; others are wingless. Young insects are gregarious (tend to remain in groups) but they later disperse to branch tips where they feed by sucking plant sap from tender foliage and twigs. Control on mature trees is not recommended as damage is limited and trees quickly recover. On small or newly planted trees, apply an insecticide if desired or when the insect population is great.
Contact your local Cooperative Extension office for insecticide recommendations.
