Quercus robur mature oak acorns becoming ready in early autumn late summer and infected by gall wasp
Andricus quercuscalicis is a gall wasp species inducing Knopper galls. Knopper galls develop as a chemically induced distortion of growing acorns on Pedunculate Oak trees, caused by gall wasps, which lay eggs in buds with their ovipositor.
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Photo credit: © Yon Marsh Natural History / Alamy / Afripics
License: Licensed
Model Released: No
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