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From: www.tiscali.co.uk/reference/
tiscali


insects

Insects - Knopper Gall Insects - Knopper Gall
Knopper Gall
Length up to 28mm

Deeply ridged outgrowths on acorns of pedunculate oak caused by larvae of tiny gall wasp Andricus quercuscalicis. Subsequent generation develops in galls induced in Turkey oak catkins. Cycle is then repeated in pendunculate oak.