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Knopper galls and acorns

Knopper galls and acorns

Galls are growths on plants, often trees, created when some species of wasps lay their eggs there. Oak trees suffer from several types. Knopper galls affect acorns.

Knopper gall and acorn

Knopper galls were first recorded in Britain in the 1960s, but have now spread across the mainland.

Knopper gall, Barley Field