Plum Lappet

I found it on house's balcony this morning.
The larva lives mainly on Prunus, but also on Pyrus, Quercus, Tilia, Betula, Alnus, Ulmus and other trees. Hibernates as a part-grown larva on a twig of the food plant. Pupates in a though cocoon.

The wingspan is 30–50 mm for males and 50–60 mm for females. The adults fly in one generation a year; mainly in June and July. When conditiones are favourable, a partial second generation occurs during September. They come to light.