Schmalblättriges Wollgras
The larvae feed on "Eriophorum angustifolium". They mine the leaves of their host plant. Initially, the larva bores into the stem of the host plant and mines the lower part of the leaf. After overwintering the larva creates a short pale reddish gallery in the lowest part of the leaf it overwintered in. Later, this mine is extended upwards in the green part of the leaf. Full-grown larvae leave the mine to pupate. Larvae can be found from autumn to spring. The larvae have a dull yellow body and a dark brown head.