Dasineura marginemtorquens
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willow leaf with galls of Dasineura marginemtorquens (click on image to enlarge it)
Source: Wikimedia Commons
Source: Wikimedia Commons
Dasineura marginemtorquens (Bremi, 1847)
This gall midge is found northern parts of Europe and Asia. It develops on Salix viminalis and populations can reach a stage when the growth of the tree is reduced. The female lays eggs on young developing willow leaves and the larvae induce the formation of galls along the leaf margins. A leaf can contain more than 50 galls. The adult midge is 2-3 mm long and there are typically several generations per year.
