A vulnerable Red Data Book species, of conservation concern under the UK Biodiversity Action Plan, confined to reed-beds at Chippenham Fen and Wicken Fen in Cambridgeshire and at Bure Marsh and Hickling Broad in the Norfolk Broads, with a small and declining population in Dorset. In Hampshire, recorded once, at Axmansford on 2 July 2010, the likely origin being from reed used for thatching: a house two doors away being re-thatched using reed imported from Poland. Wingspan male 30-42mm, female 38-56mm. Larva feeds within stems of Common Reed, over-wintering twice.

Flightime guide
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