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Pontania viminalis
The sawfly Pontania viminalis (syn. Eupontania gallarum & Eupontania viminalis) causes galls on the shape and the size of a pea which are formed on the midrib on the underside of the leaf and often reddens. In this case the host plant is a Salix amplexicaulis (S. purpurea var. amplexicaulis) and it was spotted in Pelion mountain, Greece.
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