Last modified: Jan. 28, 2020, 12:07 p.m.
Still a not so common species, but there is often a lot of confusion with the rare C. lutipennella in all stages.
There is a lot of variation in colours: from ochreous over ochreous-brown till ochreous-greyish. There is often a lighter costa area visible.
Wingspan is 10,5–12,5 mm.
The antennae are mostly white, or sometimes alternately ringed black or brown and white till the tip.
The light-brown tubular case is 7 mm long. The mouth angle is 45°.
See also bladmineerders.be.
At first, there is a very little blotch mine.
The eggs are deposited at the underside of the leaves.
After eclosion, the larva makes a tiny blotch mine. The first case is made from a small part of the leaf and enlarged with silk. Full-grown larvae in May.
In all stages this species is difficult to separate from C. lutipennella, and it is often confused with that species.
The adults are on the wing in June and July.
In forests where Quercus grows.