ワタスゲ
The larvae feed on "Carex elata", rare spring sedge ("Carex ericetorum"), "Carex ferruginea", wood segge ("Carex sylvatica"), bladder sedge ("Carex vesicaria"), common cottongrass ("Eriophorum angustifolium"), "Eriophorum latifolium", hare's-tail cottongrass ("Eriophorum vaginatum") and "Scirpus sylvaticus". Young larvae make a long, brown corridor, and hibernate in this. In spring, the larva makes a new mine in another leaf, starting near the base of the blade. The mine widens upwards and forms a blotch at the end. Pupation takes place outside of the mine.