Grau-Erle
The larvae feed on "Alnus" species, including "Alnus incana", "Alnus rubra" and "Alnus rugosa". They mine the leaves of their host plant. The mine has the form of a tentiform mine on the underside of the leaf. The mine is roundish and the loosened epidermis is much wrinkled, resulting in the leaf being rather arched at this place.