Galls similar to those of the grape tube gallmaker, Ampelomyia viticola, differing in their placement exclusively on the lower leaf, their blunt, squat, rounded shape, and their apparently permanent yellow color, never turning red. They have been observed on Vitis mustangensis in Texas as early as May, persisting through June, beginning to drop in July, and having completely fallen off the leaf by September, leaving circular gaps in the pubescence of the leaf containing small scars at the attachment point.

Similar galls have also been observed on Vitis labrusca.