An uncommon species in Belgium, but probably overlooked.
transparant monophagous larva lives in a blotch mine in the leaves on Betula. It starts near the leaf margin. Mature larvae leave the mine and pupate in the ground.
adults fly in April and early May. They can be observed resting on the
trees or flying around the trees in sunshine. Later they occasionally
come to light.
Luxembourg, Nassogne, 14 May 2010.
mine on Betula
with 3 larvae
(Photo © Chris Steeman)