The larvae feed on bent (Agrostis species), common wild oat (Avena fatua), tor-gras (Brachypodium pinnatum), false-brome (Brachypodium sylvaticum), reedgrass (Calamagrostis species), tufted hairgrass (Deschampsia cespitosa), tall fescue (Festuca arundinacea), wood millet (Milium effusum) and Poa badensis. They mine the leaves of their host plant. The mine has the form of a long narrow yellowish corridor, descending from the leaf tip to the base. Three to four larvae can be found on a single leaf and several larvae may be found in a single mine. Pupation takes place outside of the mine. They are yellowish with a pale brown head. Larvae can be found from February to the end of May and again from June to July.