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Galls on Willow

From last September: red bean galls on the leaves of a willow bush (Salix sp) .  These are caused by larvae of the sawfly Pontania proxima (Hymenoptera: Tenthredinidae).  The underside of the leaves look like this:

Photos taken beside the top lake, Whiteknights Park, Reading, UK, on 2013-09-21.

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