Adult honeylocust plant bug. Honeylocust plant bugs commonly infest honeylocust in late spring. This common damaging species of plant bug is generally green. When immature, it superficially resembles an aphid but is much more active. Injured foliage shows yellow or brown spotting.
Leaves become twisted, and twig dieback can occur during heavy infestations.
The honeylocust plant bug particularly favors new foliage. This insect can indirectly limit honeylocust podgall midge by destroying gall-susceptible new growth. A single generation of these Insects occurs, with damage peaking in late May or early June. Chemical controls are recommended only when spring growth is seriously threatened, because regrowth occurs in June when insect populations diminish. Inside each pod gall, two to eight cream-colored larvae or pupae may be found.