A common species throughout Belgium.

The larva makes a blotch-mine on the underside of the leaves of Betula. It pupates in a cocoon inside the mine. The pupa of the second generation hibernates.

The adults fly in two generations a year: May and August.

ID mine: small mine (about 10-15mm) on underside of birch leaf, lower cuticle greenish, turning brown with age and lower epidermis with 1 - 6 folds.