Last modified: Jan. 14, 2021, 6:34 p.m.
A common species in Belgium.
Egg on upperside of the leaf close to the midrib.
The mine starts in the midrib or a large vein, further the caterpillar makes a blotch at one side of the vein. The frass is usually deposited in two lines at both sides of the mine.
See also bladmineerders.be
The adults fly in one generation a year during June.