Woody, tapered stem swelling (192) ....... Neolasioptera perfoliata (Felt)
Swellings appear near the upper part of the flowering stems. Larvae overwinter in the stems. Hosts: E. hyssopifolium, E. perfoliatum. Distr.: Massachusetts to Virginia.
”- Raymond J. Gagne: (1989) The plant-feeding gall midges of North America©