Last modified: Feb. 18, 2020, 9:39 a.m.
A not so common species in Belgium, but probably much more widespread due to the difficulty of the mines of Stigmella anomalella.
The mine is a long sinous gallery that gradually widens. The black frass is in a central line throughout. Sometimes it's hard to distinguish the mine from that of Stigmella anomalella.
See also bladmineerders.be
Pupation takes place in a red-brown cocoon spun at the base of a leaf-stalk or on a leaf of the foodplant.
The adults fly in two generations: April-May and July-August.