Knopper Oak Gall

18 Sep 2022

Knopper gall, caused by the Cynipid gall wasp Andricus quercuscalicis

Ink painting/drawing of knopper gall, caused by the Cynipid gall wasp Andricus quercuscalicis.

The drawing shows a healthy acorn and a parasitised, distorted gall-acorn, both attached to the same stem.

Top: scanned image

Bottom: photograph

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Ralstonia solanacearum