Phalaris arundinacea
The larvae feed on "Anthoxanthum odoratum", "Festuca arundinacea", "Hierochloe odorata", "Milium" species, "Phalaris arundinacea" and "Phragmites australis". They mine the leaves of their host plant. They prefer the lower leaves. The mine has the form of an elongate, rather irregular blotch. Most frass is ejected, but the remaining frass is concentrated in a few heaps. A single larva makes several mines. Pupation takes place outside the mine.