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Knopper gall | by Dom Greves
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Knopper gall

Knopper gall (Andricus quercuscalicis) on oak. Surrey, UK.

 

The first generation of this tiny wasp form these familiar galls on our native pedunculate oak. The second generation develops in the catkins of Turkey oak.

 

photo.domgreves.com

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Taken on August 5, 2016