Last modified: Feb. 22, 2021, 2:01 p.m.
A fairly common species in Belgium, more observed in the northern part of the country.
See also bladmineerders.be
The young larva makes a circular blotch mine in the leaves of the food plant. Later on it constructs a flat case cut from the blotch and drops to the ground. This first case is replaced by a bivalved case made from two oval pieces of dead leaf. The caterpillar feeds on dead leaves.
Pupation in the case attached to some object on the ground.
The moths are active during the day, they prefer bright sunshine.
The adults fly from mid May till the end of June.