Knopper Oak Gall Wasp - Andricus quercuscalicis
A Cynipid gall wasp that causes a gall to form on the acorns of various oaks. The gall is seen more often than the adult wasp.
On Pendunculate Oak.
May to July.
Knopper Galls develop as a chemically induced distortion of growing acorns on Pendunculate Oak trees, caused by cynipid gall wasp Andricus quercuscalicis which lays eggs within buds using the ovipositor.
A recent introduction to the British Isles, first arriving in the 1960s and now found throughout England, Wales and as far north as Scotland.
Common in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015