Hairy Beech Gall - Hartigiola annulipes

    Description

    Hartigiola annulipes is a midge that causes galls to form on the leaves of beech. Young galls develop early in the season as a small circular pustule or flattened dome which is visible on both leaf surfaces. Mature gall is cylindrical, hairy or smooth and up to 6 mm high when mature in late August or September. The gall is pale green and any hairs either pale or reddish brown. The larva is white. The gall is seen more often than the midge.

    Photo ID?
    Habitat

    On beech leaves.

    When to see it

    August and September for mature galls.

    Life History

    The gall falls to the ground in Autumn, leaving circular hole in the leaf. Pupation takes place in the fallen gall and the adult midge emerges the following Spring ready to lay eggs on the new growth of leaves.

    UK Status

    Fairly frequent and widespread in Britain.

    VC55 Status

    Status in Leicestershire and Rutland not known.

    Leicestershire & Rutland Map

    UK Map