The gall is a small rosette, most often in an axillary bud on sallows.

In Britain sallow usually refers to S. aurita, S caprea, S. cinerea and the hybrids between these species.

The rosette leaves are not obviously hairy and the full grown larva does not have a sternal spatula (i.e. a structure on the underside of the thorax of the final (third) instar larva of Cecidomyiidae).

[1][3] Media related to Rabdophaga rosariella at Wikimedia Commons

This article related to members of the fly infraorder Bibionomorpha is a stub.