Sorbus torminalis
The larvae feed on "Amelanchier ovalis", "Cotoneaster", "Crataegus laevigata", "Crataegus monogyna", "Crataegus pentagyna", "Sorbus aria" and "Sorbus torminalis". They mine the leaves of their host plant. The mine consists of a slender corridor, with a relatively broad, continuous, frass line, that always leaves a clear margin at either side. This corridor winds freely through the leaf. This initial corridor widens into a blotch that mostly lies along the leaf margin. Pupation takes place outside of the mine.