Last modified: Jan. 18, 2020, 10:58 a.m.
A fairly common species in Belgium, more observed in the northern part of the country.
See also bladmineerders.be
The adults fly from mid May till the end of June. The moths are active during the day; they prefer bright sunshine.
The young larva makes a circular blotch mine in the leaves of Vaccinium myrtillus, Rubus chamaemorus, Swida or Prunus spp. 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.