Andricus testaceipes

    Alternative names
    Andricus sieboldi

    The cynipid gall wasp Andricus testaceipes causes a gall to form on Oak. The single-chamber galls sometime coalesce. The agamic generation galls (known as Red Barnacle-galls) are usually found low on the main trunk of a smallish tree or sapling, or else on branches near the ground. The sexual generation galls affect the leaf stalk or midrib. This gall complex is not yet fully understood and subject to some debate.

    Identification difficulty

    Where a suitable host oak is available.

    When to see it

    The galls persist for some time after the emergence of the wasps.

    Life History

    See 'Description’.

    UK Status

    Status of Andricus testaceipes is difficult to determine as it is not well 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