The larva of the gall midge Rondaniola bursaria causes galls to form on the leaves of Ground-ivy (Glechoma hederacea). The gall takes the form of a hairy cylinder up to 4 mm tall, often several on the upper surface of a leaf. The galls are initially green, later light red or brown. Each gall contains a single larva. Galls fall off the leaf in late summer leaving a neat, circular hole. 

Gall  Adult

May occur wherever Ground-ivy is found.

Galls best looked for from late June to August.

Widespread in the southern half of Britain.

Status in Leicestershire and Rutland not known.