Asphondylia imbricata Plakidas is a multivoltine species. Summer galls occur in the apical meristems of Symphyotrichum lateriflorum ... These galls are green, conical and composed of imbricated leaflets. One larva develops per gall.
”- JD Plakidas: (2016) The Gall Midges (Diptera: Cecidomyiidae: Cecidomyiinae) From Allegheny County Pennsylvania©