The host plant is clearly Salix herbacea, as anticipated already by Bruun & von Schantz. Populus tremula and, of course, several species of Salix were accepted in confinement without any problem. It hibernates in the second instar.
Finland, EnL: Kuonjarvarri, ex ovo July 1998, Leg: P. R. Sundell
Photo © Kimmo Silvonen