The larvae of the gall wasp cause Diplolepis spinosissimae cause galls to form on various rose species, being most frequent on Burnet Rose (Rosa spinosissima), but also found on other rose species including Dog-rose and Sweet-briar. The galls are smooth, reddish-green, ovoid in shape and may occur on the leaf petiole or protruding from both sides of the leaf but quite often the galls coalesce.  Each gall contains a single white larva.

Gall Adult

Gall records for this species must be accompanied by a photograph. Please also state the host species when submitting your record.

Galls may be found in areas where the host rose species occur.

When rose species are in leaf.

There is a single generation, with the larva hibernating and pupating in gall.

Widespread but infrequent in Britain, most records seem to come from coastal areas where Burnet Rose is more common.

Rarely recorded in Leicestershire and Rutland.