Last modified: April 23, 2020, 5:37 p.m.
A very rare species in Belgium, but as with many others probably overlooked. The search for the cases after 2004 gives us a better look at the distribution of this species.
This species is light brown with pale length lines. The antennae are alternately ringed brown and white nearly till the tip. The wingspan is 10–17 mm.
A straw-coloured, slender, three-valved case of the type “tubular silken case”; length about 10 mm, mouth angle 45°–60°.
See also bladmineerders.be.
The mines are very clear white to see, because the caterpillar makes a lot of silk around the feeding holes.
The eggs are deposited at the underside of a leaf. Cases are also most of the time to be found there. Cases from August till June of the following year. The larvae are fully fed in June. They can also crawl away a lot to overwinter. This species prefer mostly sandy soil.
The adults fly in one generation a year from late June till the middle August. They comes to light.
The larva feeds mainly on Achillea millefolium and Artemisia vulgaris but also on Carduus, Inula, Leucanthemum and others are taken.