Last modified: April 8, 2021, 6:53 p.m.
A rather common species in Belgium.
The egg is deposited on the underside of the leaf.
The larva makes a long and slender gallery with linear frass which leads abruptly into an irregular blotch in which the frass is scattered in the centre.
See also bladmineerders.be
The caterpillar pupates in a pale ochreous cocoon and is spun inside the mine.
The adults fly in two generations: from May to June and again in August.