Family Tenthredinidae (Common sawflies) » Euura proxima (Serville, 1823)
Gall size up to 12 mm long by up to 6 mm wide. The sawfly Euura proxima is the cause of these fairly large and distinct shiny red, bean-like galls which projects from both surfaces of narrow willow (Salix) leaves, notably White Willow (Salix alba) and Crack Willow (Salix fragilis). Each gall usually contains a single larva, which feeds on the leaf tissues within. There are 2 broods per year. Fairly common and widespread throughout Britain.
Found on White Willow (Salix alba), local riverbank, South Staffordshire. July 2020. Photos © Peter Hillman. Species identification confirmed and recorded by an expert from iRecord.