common species in Belgium.
larva makes a leafmine usually starting close to the edge of the leaf
of Fagus sylvatica.
The initial gallery leading away from the leaf edge and progresses
towards the midrib. It pupates in a cocoon spun on detritus.
adults fly in two generations: April-May and from late June towards
mine: a small mine, usually starts from the leaf edge and works up
towards the midrib, regularly crossing veins. Initially, the gallery is
very small with linear frass which soon become broader with frass in
arches. Towards the end the frass is usually dispersed again and often
linear where the larva leave the gallery to pupate.
Namur, Han-sur-Lesse, 25 November 2006.
mine on Fagus sylvatica
(Photo © Chris Steeman)