Last modified: July 13, 2021, 8:19 p.m.
In the past there has been a lot of confusion in the C. serratella group. Older determinations must be treated with big care! It has been taken into account for the post-2004 distribution that only individuals who have been checked for genitalia are eligible.
The caterpillar makes a 6–7 mm trivalved, tubular leaf case. At first, it is light brown, lateron it changes into darker brown.
The mouth angle is 45°.
See also bladmineerders.be
The larvae live at the underside of the leaf, making rather big fleck mines and are fully grown at the end of May.
The adults are on the wing from the end of June till the beginning of August.