The larvae feed on Bromus ramosus, Dactylis glomerata, Deschampsia cespitosa, Festuca gigantea, Festuca pratensis, Lolium perenne Melica uniflora, Milium effusum, Poa humilis and Poa pratensis. They mine the leaves of their host plant. The mine has the form of a long, narrow, white corridor, descending from close to the leaf tip to the leaf base or even the stem. The frass is deposited in an inconspicuous grey line. They are lemon yellow. Larvae can be found from late autumn to May.
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