common species throughout Belgium.
larva makes a blotch-mine on the underside of the leaves of Betula.
It pupates in a cocoon inside the mine. The pupa of the second
adults fly in two generations a year: May and August.
mine: small mine (about 10-15mm) on underside of birch leaf, lower
cuticle greenish, turning brown with age and lower epidermis with 1 - 6
Namur, Lavaux Ste.-Anne, 30 March 2007.
ex pupa (mine 25/11, indoors 15/3, imago 26/03)
(Photo © Chris Steeman)