The larvae create a slender gallery mine which is either straight or spirals to a small orange-brown blotch.
Recorded in 66 (24.4%) of the 270 2km squares of Huntingdonshire.
Last recorded in September 2020
Recorded date range (Adult): 18 July to 02 August
Recorded date range (Larva/Leafmine): 17 June to 30 November