Knopper Gall(Cavenham Heath NR)

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About

The Knopper Gall is caused by a tiny gall wasp, Andricus quercuscalicis. It produces ridged outgrowths on the acorns of our native Pedunculate Oak; forming in August they are sticky and red, later becoming woody and brown. A second generation then develops in the catkins of Turkey Oak.

How to identify

Unmistakeable: the Knopper Gall is a nobbly, bowl-shaped protrusion from acorns.

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