Last modified: Jan. 19, 2020, 10:56 a.m.
A fairly common species throughout Belgium. With the present knowledge of leafmines, more frequently observed than in the past.
Yellowish with light brown head capsule.
First instars live in a transparant serptentine mine in which the frass is arranged in a continuous line. Later on the mine becomes a whitish blotch with the black frass concentrated in one corner. When this blotch is enlarged, the leaf edge is turned over it, and the last instars live freely on the leaf.
See also gracillariidae.net and bladmineerders.be.
The free living caterpillars construct a typical, downwards turned, conical leaf roll, sometimes called pepperbox, of which the bases is the broadest. The last instar bites a circular exit hole in that papperbox. It pupates in a pure white hammock-like cocoon which is attached between this exit hole and another point in the pepperbox. After emergence of the adult, the pupal skin protrudes from the exit hole. The moths are active during late afternoon around their food plant and later come to light.
The adults fly in one generation a year: emerging during September, overwintering and then flying until May.