The larvae cause a small growth (known as a gall) on the catkins of willows (Salix species).

Eggs are laid during the autumn in the axils of catkin buds and hatch the following spring.

[6] Close examination of the gall is necessary as Redfern et al. (2011) note that sometimes, thickening of the rachis can be wound tissue rather than a gall and according to Plant Parasites of Europe identification is only possible by examining the weevils.

They can be found from May onwards, browsing on the leaves, removing patches of tissue and exposing the network of fine veins.

[4] Found in western and central Europe including Great Britain (common) and Scandinavia.