Harmandiola tremulae


    Harmandiola tremulae is a gall midge whose larvae feed on Aspen causing galls to form on the leaves. The galls are globose 3 to 4 mm across with thick walls, glossy-red when mature. The galls are far more likely to be found than the adult midge.

    Identification difficulty

    Adult Gall


    On Aspen (Populus tremulae).

    When to see it

    The larval stage is from June to September.

    Life History

    The larva is orange-red.

    UK Status

    Widespread, though little recorded in Britain. 

    VC55 Status

    Thought to be fairly frequent in Leicestershire and Rutland.

    Leicestershire & Rutland Map

    MAP KEY:

    Yellow squares = NBN records (all known data)
    Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

    UK Map