Larvae of this species are leaf-miners, using Sea Club-rush (Bolboschoenus maritimus), Saltmarsh Rush (Juncus gerardii) or Round-fruited Rush (J. compressus).
The leaf-mine is formed in April-May and appears as a short, broad, greenish white mine, with the frass at first packed at the start of the mine, but later in a thick, central line.
The larva is pale greenish yellow with a pale yellow head.
Pupation is under a slight web on the midrib of a leaf.
The moth flies from June to early August and may be found in salt-marshes in England and south-east Scotland, as well as in the south coast of Ireland.
It can usually be separated from its close relatives by the presence of a white streak from the base in the costal half of the forewing.