The larvae form a blotch mine on the underside of a leaf causing creases in the lower epidermis of the leaf.
Recorded in 69 (25.6%) of the 270 2km squares of Huntingdonshire.
Last recorded in October 2020
Recorded date range (Adult): 23 April to 08 September
Recorded date range (Larva/Leafmine): 21 April to 28 November