Last modified: Jan. 15, 2020, 1:10 p.m.
A rare and local species in Belgium, probably overlooked.
The adults fly in two generations a year; May-June, and August-September.
The green larva makes a narrow gallery in a leaflet of Sorbus aucuparia, which slowly gets wider and often follows the leaf margin. The frass in the initial gallery is linear, leaving narrow margins, thereafter it's variable, but usually lying in arches.