Appearance
Its galls show in their external morphology resemblance to the mossy rose gall or robin's pincushion , but the surface of the gall is less covered and the emergences on it are more spine-like. It may appear together with ''D. rosae'' on the same host plant. Galls of ''D. mayri'' are multilocular and its chambers have thicker walls than found in ''D. rosae''.
Predators
In the winter time galls of ''D. mayri'' are often opened by predators just as are the galls of ''D. rosae''. These predators may be birds as in the case of other Cynipidae galls: for ''D. rosae'' the lesser spotted woodpecker , for ''Andricus'' spp. and ''Neuroterus'' spp. the great tit .In its galls occurs the same parasitoid assemblage as known for ''D. rosae''. The most abundant parasitoids of both galls are ''Orthopelma mediator'', ''Torymus bedeguaris'', ''Glyphomerus stigma'' and ''Pteromalus bedeguaris''. One inquiline species, ''Periclistus brandtii'' also occurs in both galls. ''Caenacis inflexa'' is exclusively the parasitoid of this inquiline. Other species as ''Torymus rubi'', ''Eupelmus urozonus'', ''Eupelmus vesicularis'', ''Eurytoma rosae'' can be the parasitoids of both gall inducers and the inquiline.
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