not so common species in Belgium.
larva makes a leafmine on Corylus
avellana and rarely also on Carpinus
betulus. The course of the mine is sinuous and rarely following a vein.
adults fly in two generations a year: in late April-May and July-August.
mine: starts as a narrow gallery almost or completely filled with
frass, when its getting broader, the frass is placed in irregular arcs,
leaving narrow clear margins, abouth 1/3 of width of gallery. Width at end of the gallery is greater than that
of the larva. The mines of Stigmella microtheriella are sometimes very similar, but in this species the frass in the early
mine is narrow linear leaving clear margins. In S. floslactella
the frass is broad and fills almost or completely the whole width of the gallery.
Namur, Belvaux, 02 November 2006.
mine on Corylus avellana
(Photo © Chris Steeman)