Salix viminalis
The larvae feed inside the stems of various "Salix" species, including "Salix viminalis". According to Heath and Emmet (1985) the larvae give little external sign apart from a slight browning, and at the edge of a broken stem frass may be seen. The larvae feed between the wood and the bark and can be found in their tunnels when the bark is peeled back. When there are galls they can be pear-shaped, or a ″peculiar shape″ with the ″diameter of the stem above the gall greater than that below, which continues for some distance″. Galls can be similar to the sallow clearwing ("Synanthedon flaviventris").