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. After the adult midges emerge, the galls drop, leaving bare leaf stalks. The honeylocust podgall midge has multiple annual generations. It is most active from the time of first shoot growth through midsummer.
Infestations occasionally can be severe enough to temporarily destroy all new growth.
Leaflets that have already expanded are not injured by the insect. All common honeylocust varieties appear to be susceptible. Severe galling produced by the honeylocust podgall midge. Natural controls include severe weather and a small parasitic wasp that attacks young midge larvae. Heavy midge infestations often collapse when new growth ceases and the trees are no longer attractive to the egg-laying adult midges.