Last modified: March 25, 2021, 12:08 p.m.
A rare species in Belgium, only known from WV. It can be locally common to abundant where the food plant grows.
The case is a seed capsule of the food plant: L. vulgare.
See also bladmineerders.be.
The eggs are deposited on a flower of the food plant.
The larvae are eating from the seeds. From time to time they change to a bigger seed capsule. The case is 5–8 mm. The mouth angle is 90°. The larvae or cases are to find from September till May. Once fully fed the larvae bore themselfs for the hibernation in a stem, of the host plant or some other plant nearby. The opening is closed with silk.
They are on the wing from early July till the end of August.