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Willow Gall Sawfly (Pontania (Potania) proxima)

Observed: 6th August 2013 By: ThistleThistle’s reputation in InvertebratesThistle’s reputation in InvertebratesThistle’s reputation in InvertebratesThistle’s reputation in Invertebrates
Willow Gall Sawfly (Pontania (Potania) proxima)
Description:

A gall - presumably formed by an insect - on a weeping willow (Salix sp.) Can anyone offer an ID, please?
Edit: Changed to match Simon's ID. Many thanks.

Identifications
Species interactions

No interactions present.