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


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

UK Map