The abdomen is green with dark brown transverse bands. Last instar nymphs emerge from the galls in spring and molt to the adult stage as new leaves are opening on the host trees. The apex of the abdomen of the last instar nymph is armed with heavily sclerotized teeth which the nymph uses to cut its way out of the woody gall by wagging the tip of the abdomen. Subspherical galls form around the young nymphs. I have found as many as 13 nymphs per gall.
Nymphs develop throughout the summer and overwinter as last instars.
As in the other species of gall-forming hackberry psyllids, many petiole gall psyllid nymphs are parasitized by Hymenoptera larvae. Infested leaves die in the fall instead of undergoing abscission and do not fall from the trees. Heavily infested trees are recognizable during the winter by the presence of the dead leaves after uninfested leaves have fallen from the tree. Because significant damage to the tree does not result from infestation, control of hackberry petiole gall psyllids is not recommended. Selected References Johnson, W.T. 1988.