Acalitus brevitarsus

    Alternative names
    Eriophyes brevitarsus

    Acalitus brevitarsus is a mite that causes blister like galls to form on the leaves of Alder. Like many mite galls, the leaf is made to grow clusters of hairs, called erineum, among which the mites live. On the underside of the leaf these galls have a shiny pale brown appearance. The galls are seen more often than the mite.

    Identification difficulty

    Adult Gall


    Wherever Alder is found.

    When to see it

    The galls are to be found when Alder is in leaf. They usually appear in June and reach full size in September or October.

    UK Status

    Widespread, but under recorded in Britain.

    VC55 Status

    Status in Leicestershire and Rutland not known.

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    Leicestershire & Rutland Map

    MAP KEY:

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

    UK Map