A recent arrival (2009) in Belgium.
monophagous larva feeds on Betula.
The mine starts as a narrow gallery near the midrib and gradually
becomes a large blotch. Frass in long threads. Pupates in a tough
silken cocoon in the earth or debris.
adults fly from late April towards the end of May. They can be observed
resting on the
trees or flying around the trees in sunshine. Later they occasionally
come to light.
Oost-Vlaanderen, Kluisbergen, 22 May 2009.
mine on Betula
(Photo © Chris Snyers)