Last modified: Nov. 7, 2024, 3:18 p.m.
A very rare species in Belgium.
Native
The egg is deposited on the underside of the leaf.
The mine starts as a very contorted gallery on a small surface. The frass in that part of the mine is reddish. Further on the gallery widens into a very wide gallery or a elongated blotch where the black frass is dispersed.
See also bladmineerders.be
The cocoon is blackish brown.
The adults are on the wing in May and June.
The host plants are Betula and occasionally Coryllus avellana.