Last modified: Feb. 18, 2020, 10:29 a.m.
A fairly common species throughout Belgium.
The egg is usually on the underside of the leaf, occasionally on the upperside.
The mine starts as a circular reddish black spot without a preliminary gallery and with a very dark centre . Eventually the mine becomes a large circular blotch with little dispersed black frass outside the dark spot. Often there are several mines in a leaf.
See also bladmineerders.be
Pupates in a dark blackish green cocoon spun on the surface of the ground.
The adults fly in one generation a year during June and July.
The mine is found on Betula.