Wingspan of 15-20 mm. Forewings are ash grey occasionally with a blue tinge. Hindwings are grey-brown.
First instars are orange coloured with a brown head, measuring ca. 1 mm in length. The final instar is 14-15 mm in length, pale ochreous in colour, with the anal and prothoracic plates darker coloured.
Initially yellowish in colour and becoming orange, 1 mm in length. Typically laid on the bark of trees.
Flax and cereals.
First instars mine leaves forming irregular blotch like mines. Later instars feed on the uppermost leaves and ears, where the most serious damage occurs.
1 (climate dependent)