Last modified: Jan. 15, 2020, 2:49 p.m.
A common species in Belgium.
The egg is laid on the upperside of Quercus near a vein.
The larva makes a slender gallery with linear or broken frass leaving clear margins, following the midrib or a vein (usually outwards towards the leaf margin), turns back and becoming abruptly a rectangular blotch with the frass usually gathered along the side of the blotch resting on the rib or in the corner where the larva has turned back. Often several mines on the same leaf.
See also bladmineerders.be
Pupates outside the mine.
The adults fly in one generation a year during June.