Last modified: Jan. 21, 2020, 10:02 p.m.
A fairly rare species in Belgium.
See also bladmineerders.be
The larva lives inside a blotch mine on Betula and Ulmus. A light web is spun beneath the mine and the larva moves between web and leaf. Frass is ejected from the mine and collected on the web. It hibernates in a cocoon within the mine, later it pupates in a boat-shaped cocoon amongst debris on the ground.
The adults fly in one generation a year during June and July.