A common species in Belgium.
yellowish larva makes a leafmine on Quercus petraea and Q. robur. The
mine is a long irregular gallery with the frass lying in a very small
line in the initial part and widens later, but never broader than 1/3
of the gallery, leaving broad clear margins. Pupates in a dark brown
cocoon among leaf litter.
adults fly in two generations a year; from May to June and again onwards from August till September.
Liège, Liège - Coteaux de la Citadelle, 09
mine on Quercus
- view upperside, det. by W. N. Ellis
(Photo © Jean-Yves Baugnée)