Last modified: April 23, 2020, 5:55 p.m.
A not so common species in Belgium but found throughout the country after 2004.
The forewings, head and thorax are shiny greyish. The antennae are ¾ dark and ¼ (at the tip) clearly white.
The wing span is 9–11 mm.
The brown case is lobe-shaped and is laying almost flat on its leaf, so the mouth angle is 0°. Ventrally, there is a distinct keel.
See also bladmineerders.be.
The fleck mines are rather large, round and brownish.
The eggs are deposited at the underside of a leaf of the food plant. The caterpillars feed on both sides of the leafs and are fully grown in October. Cases are easily found in springtime on e.g. smooth Alnus stems. The adults fly in early evening and later come to light.
The adults fly in one generation a year, from late May till early July.
The larva lives on Rosaceae and on woody plants including: Alnus, Castanea, Potentilla, Rubus, Symphoricarpus, Tilia, Viburnum, etc...
So this species is extremely polyphagous: over 30 species of food plants are known.