common species throughout Belgium.
caterpillar lives in a twig or a catkin of Betula spp. The
species hibernates in the egg stage.
adults fly from the end of July till mid October. They fly at dusk
and come to light.
is also another frequent form called 'costana' with the forewing
almost entirely suffused with blackish brown, except a narrow area
along the costa towards the apical spot. See More
Antwerpen, Willebroek, 26 August 2003.
(Photo © Leo Janssen)