An uncommon species in Belgium.

The larva bores through the florets and feeds on the unripe seeds of Trifolium pratense. When the larva becomes a fourth instar a case is made. When completed it's about 6 mm long dark red-brown tubular case. Pupation in the case in the seedhead or on the ground.

The adults fly in one generation a year; onwards from May till July. They are active during sunshine, mainly before noon. They come infrequently to light.