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Knopper Galls on the fruit, acorn, of the Pedunculate or Common Oak (Quercus robur). These are caused by the lava of the gall wasp Andricus quercuscalicis. Bedgebury Forest, Kent, UK. 19 August 2005
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Wasp small six legged protection pest Insecta Insect Hymenoptera growth Gall wasp gall disease Cynipoidea compound eye colouration Apocrita woody wood tree timber science plant nature leaf green Fagaceae botany Beech family Barn Digital BarnDigital Michael Grant MIchaelGrantImages
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. These are caused by the lava of the gall wasp Andricus quercuscalicis. Bedgebury Forest, Kent, UK. 19 August 2005){kind=link}