Last modified: Nov. 14, 2024, 10:10 a.m.
A rare species throughout Belgium.
Native
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 to June and again from July to August.
The larva lives on Alnus glutinosa.