Reddening Knopper galls, Andricus quercuscalicis, caused by a gall wasp, on Common Oak.

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Photo credit: © Bob Gibbons / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: acorn, acorns, andricus, apocrita, arthropod, arthropoda, arthropods, common, cynipid, cynipidae, cynipoidea, ectognatha, english, french, gall, gall-wasps, galls, hexapod, hexapods, hymenoptera, knopper, oak, pedunculate, quercus, quercus-calicis, quercuscalicis, robur, wasp, wasps