Last modified: Jan. 17, 2020, 2:30 p.m.
A very rare and local species in Belgium, hitherto only known from the southern part of the country.
The initial gallery is long and very narrow with a thin black central frassline. Further on the mine widens into a elongated blotch where the black frass is scattered.
See also bladmineerders.be
The cocoon is pale brown.
The adults are on the wing in May and again in August.