A not so common species in Belgium, seems to be spread out lately.

The larva makes a large mine with one strong longitudinal fold on the underside of narrow-leaved willows like Salix alba, S. babylonica and rarely on S. fragilis. It's also known from Populus, but this happens occasionally. Pupation in the larval feeding place. The pupa hibernates.

The adults fly in two generations a year: in April-May and again in August-September.