Galls in which the larvae live and feed are formed on the leaves of several species of wild rose (Rosa).

[2][3] This species has been reported throughout most of the continental United States,[4][1][3] and in Canada from Alberta, Saskatchewan, and Manitoba.

[2][5][6] Diplolepis ignota galls have been reported from Rosa arkansana, R. blanda, R. carolina, R. virginiana, and R.

[2] Inquilines and parasitoids of the larvae include species of Periclistus (Cynipidae), Aprostocetus (Eulophidae), Eurytoma (Eurytomidae), and Orthopelma (Ichneumonidae).

[7] Recent studies have shown that this species is very closely related to Diplolepis nebulosa and D.