Last modified: April 23, 2019, 12:44 p.m.
A rather rare species in Belgium.
The adults fly in two generations a year; during May and June and again during August.
The bluish green larva makes a mine, generally on the upper surface of the leaves of Pyrus communis. The mine is very compact, lying on a small surface, tends to cross over, especially the initial part of the corridor is contorted with a broad to sometimes very broad black frass line. The later part of the gallery ends sometimes in a secondary blotch. It pupates in a dark reddish brown cocoon.