Last modified: Jan. 21, 2020, 10:10 p.m.
A fairly common species throughout Belgium, especially in the northern part of our country.
The mine is characterised by a narrow gallery, containing linear black frass and later leading to a small clear blotch. Subsequently the larva frequently changes its mine, and sometimes also its leaf, making a series of irregular clear blotches from which all frass is ejected. On the underside of the leaf, the larva also constructs an open network of silken threads which provide a platform from which the larva can eat and rest.
See also bladmineerders.be
The grey-brown pupa is attached to a leaf without a cocoon. They hibernate as an adult. They come to light.
The adults fly in two generations a year; during August and from late September till May.