Last modified: Feb. 18, 2020, 9:32 a.m.
A fairly common species in Belgium.
The egg is deposited at the underside in one of the angles of a rib.
The course of the mine is sinuous and rarely following a vein. In the beginning the mine is allmost completely filled with black frass. Later on in the gallery the frass is more irregular but allways in a thick central line.
See also bladmineerders.be
The adults fly in two generations a year: in late April-May and July-August.