Honeylocust plant bugs are present only in the spring. They feed on the expanding leaflets, causing them to be distorted and twisted. These leaflets usually stay on the tree, marring its appearance for the entire growing season. Heavy infestation will cause leaves to drop from the tree during June, but damaged trees will refoliate with undamaged leaves. As few as one nymph per compound leaf will cause obvious damage.
Insecticidal soap is also effective.