Last modified: Jan. 5, 2020, 6:45 p.m.
A very rare and local species in Belgium.
The larvae live in a tri-valved tubular silken case of 8 mm long, with a mouth angle of 25°–30°. The case is pale brown. It has also a double dorsal keel.
See also bladmineerders.be.
The white blotches on the leaves are easily spotted.
The larvae are full-grown around May.
Pupation takes place at ground level on the stem of the host plant.
The adults fly in one generation a year onwards from late May towards July.