Last modified: Nov. 16, 2020, 1:16 p.m.
A rather common species throughout Belgium.
The larvae live gregariously on the leaves of their foodplant. They feed from the underside, close to the midrib and later make holes in the leaf.
They hibernate in their cocoons in the soil. Pupation in a cocoon on the underside of leaves or on the ground surface in early spring.
The adults fly at dusk and come to light.
One generation a year: from mid June till mid September.