Last modified: Feb. 19, 2021, 12:31 p.m.
A not so common species in Belgium, but probably much more widespread.
The mine is a very contorted gallery which widens gradually, often forming a false blotch by merged 'S' turns, or even a true blotch. The frass lays central and is broken.
See also bladmineerders.be
The cocoon is brown to black.
The egg is deposited on the upperside, usually beside a rib.
The larva makes a leaf mine on the upperside of the food plant.
The adults fly in one protracted generation during June and July.