The larvae of the gall midge Macrodiplosis pustularis cause galls on the leaves of Oak (Quercus) species. This takes the form of a downward roll, or fold and usually affects the leaf lobe at the tip of the vein. Green at first, with pale yellow spots, later brown and contains one larva.

Macrodiplosis roboris forms narrow upward rolls between leaf-lobes

Gall  Adult

On Oak (Quercus) species.

June and July.

Widespread in areas of Britain where the host trees occur.

Status in Leicestershire and Rutland not known.