Pea Gall Sawfly - Pontania viminalis

    Alt Name
    Eupontania gallarum and as Eupontania viminalis

    The sawfly Pontania viminalis causes galls to form on certain Willow species

    Identification difficulty

    Adult Gall


    Anywhere that the host plants such as Crack-willow, Purple Willow and Osier are found.

    When to see it

    There are two broods with adults flying May/June and July/August.

    Life History

    The pea shaped gall is formed on the midrib on the underside of the leaf and often reddens.

    UK Status

    Occasional 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