Last modified: Dec. 9, 2024, 5:14 p.m.
A very rarely seen species in Belgium.
Native
Wingspan 21–25 mm.
The forewings are ochreous yellow with little black dots all over the wing.
The wings are sickle-shaped, and there are also many light longitudinal lines.
The antennae are thickened at the base.
See also bladmineerders.be.
Caterpillars are not distinguishable from those of Coleophora lixella due to many misidentifications in the past.
The case is flattened, at first whitish yellow changing rather quickly to brown.
Cases are 13–17 mm with a mouth angle of about 30°.
Young larvae live on several species of Lamiaceae, making their first case from the leaves. At first, they eat flowers and seeds of the food plant. Just before winter, they switch to grasses, mining them.
Larvae live from October till May.
There has been a big confusion with Coleophora lixella; therefore all the information in the old literature should be treated with caution.
The adults fly in one generation a year from May till July.
When young, they are to be found on Lamiaceae. Later on they change to grasses.