The larva of the gall midge Lasioptera rubi produces galls in the stems of various plants of the Rubus family, particularly in Bramble stems. The gall takes the form of a swelling, green at first, later brown and hard. The swelling is quite rounded in shape and up to 5 x 2 cm. The gall surface sometimes has longitudinal fissures. Old galls with exit holes may persist on the stems.

An Ambrosia gall; a fungus is also involved in the gall formation

The gall-wasp Diastrophus rubi causes galls on bramble stems, but these are knobbly and with many chambers.

Gall  Adult

Where the host species occur.

The gall can be seen all year round.

It is difficult to determine the exact status in Britain due to lack of records.

Status in Leicestershire and Rutland not known.