rare species in Belgium. It was formerly more widespread and is now
declining rapidly. Most observations are now from the Kempen and the
south of the country.
larva feeds mainly Betula and Alnus glutinosa,
also on other deciduous trees. The caterpillars remain together until
they are about half-grown. Hibernates as pupa in a loose cocoon on the
adults fly from mid March till early May, but most specimens were seen
during end of March till early April. The males are active during
daytime and at dusk. Both sexes come to light, but males infrequently.
Luxembourg, Wellin, 25 March 2003.
female (Photo © Chris Steeman)