Phalaris arundinacea
The larvae feed on velvet bent ("Agrostis canina"), meadow foxtail ("Alopecurus pratensis"), false oat-grass ("Arrhenatherum elatius"), oats ("Avena" species), "Avenula pubescens", false-brome ("Brachypodium sylvaticum"), bromes ("Bromus" species), bunch grass ("Calamagrostis arundinacea"), "Calamagrostis epigejos", "Dactylis glomerata", "Deschampsia cespitosa", "Elymus repens", "Festuca rubra", "Holcus lanatus", "Holcus mollis", "Koeleria macrantha", "Luzula pilosa", "Milium effusum", "Phalaris arundinacea", "Phleum", "Poa pratensis", rough meadow-grass ("Poa trivialis"), oatgrass ("Trisetum" species) and wheat ("Triticum" species). They mine the leaves of their host plant. The mine consists of a full depth blotch mine which descends from the leaf tip. It occupies half to the entire width of the blade. Larvae may exit the mine and start again elsewhere. The frass is deposited in a narrow central line with a greyish brown colour. Larvae can be found from September to May. Pupation takes place outside of the mine.