Last modified: April 8, 2021, 6:46 p.m.
A rare species in Belgium.
The mine starts as a smal gallery following a vein. Suddenly it changes into a blotch or irregular wide gallery in which the black frass is packed up in the transition from gallery to blotch. The mine is situated usually between midrib and lateral vein.
See also bladmineerders.be
The cocoon is pale to reddish brown.
Egg on the upper side close to a vein.
The adults fly in one generations a year during June and July.