This species ... forms snap and bud galls ... similar to the situation in [Asphondylia] solidaginis. Snap galls join two or more leaves together, are formed in spring and early summer, and are usually found on leaves very close to the apical bud, rather than on more mature leaves farther down the shoot. In this respect, the galls of A. rosulata sp. nov. constitute intermediate steps between snap and rosette galls...

[this species was originally described by the authors of this paper; please refer to it for many more details of gall biology, insect life history, anatomy, and phylogeny

- Netta Dorchin, Jeffrey B. Joy, Lukas K. Hilke, Michael J. Wise, Warren G. Abrahamson: (2015) Taxonomy and phylogeny of the Asphondylia species (Diptera: Cecidomyiidae) of North American goldenrods: challenging morphology, complex host associations, and cryptic speciation^©