local and not so common species in Belgium.
larva lives on narrow-leaved Salix like Salix alba, S. dapnoides, S. fragilis, S. incana, S. purpurea and S. viminalis. It makes a large mine
on the underside of the leaf. Pupation inside
the mine in a strong brown cocoon formed from the sides of the mine.
The pupa of the second generation hibernates.
adults fly in two generations a year; from late April till May and
again during August. They come to light in small numbers.
ID: underside mine parallel to the leaf edge, the lower surface of the mine is strongly contracted, arching the upper epidermis and causing the edge to curl down, forming a narrow tube. Identification of mines on narrow-leaved Salix is not easy and therefore it's best to rear the adults.
Namur, Lavaux Ste.-Anne, 30 March 2007.
Ex larva, mines on Salix
(Photo © Chris Steeman)