Last modified: Jan. 30, 2021, 2:09 p.m.
A rare species throughout Belgium.
See also bladmineerders.be
When fully fed, the larva cuts out an oval case, when excised is portable and descends in it to the ground where it is attached to a stick. Pupation in the case.
The adults can be seen flying in sunshine around alder branches. They come occasionally to light.
The adults fly in two generations a year: from late May till June and again from July till August.
The larva lives on Alnus glutinosa.