Oak Apple Gall Wasp - Biorhiza pallida

    Alternative names
    Oak Apple Gall

    Size 2 to 3.5 mm, they are a golden chestnut colour. The apple like gall caused by ths wasp is more likely to be seen than the adult wasp.

    Identification difficulty

    Adult Gall


    Around varieties of oak.

    When to see it

    Adults emerge from the Oak Apple Galls in June and July.

    Life History

    The spongy galls contain many insects, but each gall contains only one sex. Like many Cynipidae species, Biorhiza pallida has two generations in its life cycle. One being sexual and the other agamic (females who can reproduce without mating). With Biorhiza pallida both stages of take place on Pedunculate Oak, the more commonly seen "Oak Apple Gall" is the sexual generation on the buds and the agamic generation root gall is found on the roots of the tree.

    UK Status

    Quite common and widespread throughout Britain.

    VC55 Status

    Fairly common in Leicestershire and Rutland.

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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