Last modified: Oct. 9, 2020, 12:03 p.m.
A very rare and local species in Belgium.
The egg is laid on the underside, usually not far from the midrib.
The mine starts as a very contorted gallery filled with redbrown coiled frass. Further on the gallery widens and sometimes becoming a large irregular blotch with black frass irregularly scattered in the mine.
See also bladmineerders.be
Pupates in a dark greenish brown cocoon spun in leaf litter.
The adults fly in one generation a year, mainly in July.