Eriosoma lanuginosum

    Alt Name
    Egg Gall

    Eriosoma lanuginosum is an aphid which causes the formation of a leaf gall on Elm which takes the form of a bladder looking like a pale green egg or pear which may be 6 or even 8 cm long and nearly as wide. The gall is more often seen than the adult aphid.

    Identification difficulty

    Adult Gall


    On elms, usually small leaved elms

    When to see it

    Look for galls in June and July although they may persist over winter in a hardened form.

    Life History

    Aphids feed inside the gall protected from predators.

    UK Status

    Uncommon in Britain.

    VC55 Status

    Uncommon 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