Last modified: May 1, 2020, 10:06 a.m.
A very local and rare species in Belgium.
The fore wings are ochreus brown with a small distict lighter costa line. There are a few darker length stripes with blackish and very small whitish dots. Wingspan is about: 13–16 mm.
The antennae are ringed alternately brown and white till the tip.
The ultimate case is a trivalved, 6-7 mm long tubular silken case with a mouth angle of 20°-30°. The oldest parts of the case are dark and covered with frass grains and detritus, the younger strips are much lighter and clean.
See also bladmineerders.be
Larvae in September-October. The full fed larvae leave the host plant for the winter diapause. Pupation in the spring, still in the case.
They are on the wing from the end of June till the end of August.