The larvae feed inside the seedheads of bulrush over winter. They can be detected by the presence of quantities of protruding down.
Lakes, rivers, streams, Broads and ponds.
Recorded in 73 (27%) of the 270 2km squares of Huntingdonshire.
Last recorded in August 2020
Recorded date range (Adult): 01 June to 15 October
Recorded date range (Larva/Leafmine): 23 March to 05 April