Biological notes.—This species is responsible for a woody, fusiform swelling (Figs. 11–12), 5–10 mm long on the stems and branchlets of mountain mints. The swelling is at first green, becoming dark purplish brown. A single yellow larva lives in the central longitudinal axis where it appears to hollow out the pith
”- Raymond J. Gagne: (2018) The Gall Midges (Diptera: Cecidomyiidae) of Mountainmints, Pycnanthemum Spp. (Lamiaceae)©