Last modified: June 17, 2024, 12:21 p.m.
A very rare species in Belgium, nowadays mainly distributed in the northern part.
Native
Wingspan 10,5–15 mm. The forewing color is variable; yellowish, ochreous till brownish. The lighter lines are obscure and there are most of the time dark dots in between, especially at the base of the forewings.
The antennae are ringed alternately in the first half.
The silken case is greyish and about 7–8 mm long with a mouth angle between 10°–50°.
The case is somewhat swollen in the middle and has darker length lines.
See also bladmineerders.be.
At first, the caterpillar is living in a seed till it is about 1 mm. Then it makes a silken case upon which frass and plant rests and other materials are constructed.
Finally, the caterpillar disconnects itself from the seed and goes eating other seeds.
Fully developed cases are greyish and 7–8 mm long. The caterpillars overwinter in the case.
The adults fly from the end June till the end of September.
The larva feeds on the seeds of Chenopodium andAtriplex.