found: Gagné, R.J. The plant-feeding gall midges of North America, 1989:p. 295 (Prodiplosis violicola (Coquillett). This species was once a major pest of cultivated violets in greenhouses. It also occurs on wild violets.)
found: ITIS search, July 19, 2006(Prodiplosis violicola (Coquillett, 1900), synonym: Diplosis violicola)
found: Bailey, L.H. Manual of gardening, 1925:p. 207 (Violet gall-fly: Violets grown under glass are often greatly injured by a very small maggot, which causes the edges of the leaves to curl, turn yellowish, and die. The adult is a very minute fly resembling a mosquito.)
found: Michigan State University Extension/Ornamental plants, viewed July 19, 2006(Viola insect problems. Viola gall midge larva attacks the leaves at the growing point causing a gall to form.)