The gall midge Harmandiola globuli causes galls on the leaves of Aspen and White Poplar. The galls are raised, rounded, with thin walls, and sometimes with a collar-like ring.  They 2.5 mm across and are dull red or yellowish. They contain larva which are orange when mature.

Several other Harmandiola species cause spherical galls on Aspen 

Gall  Adult

Where Aspen and White Poplar occur.

When the host species are in leaf.

Not well recorded in Britain but probably fairly frequent.

Status in Leicestershire and Rutland not known.