Salix viminalis
The larvae feed on "Salix viminalis". They mine the leaves of their host plant. They create a lower-surface tentiform mine close to the leaf margin and normally also close to the petiole. There are often two mines in a single leaf. The mine in contracted in a tube-like fashion. The pupa yellowish brown and there is no visible cocoon. The frass is deposited in a corner of the mine.