The larvae produce a distinctive larval case in their later stages with a noticeably serrated upper edge.
Margins of woods, hedgerows containing elm saplings.
Recorded in 46 (17%) of the 270 2km squares of Huntingdonshire.
Last recorded in September 2019
Recorded date range (Adult): 29 June to 21 August
Recorded date range (Larva/Leafmine): 21 May to 30 October