species in Belgium.
monophagous larva makes a leafmine, often in an angle of veins in a
leaf of Betula.
The initial gallery
is slender and usually contorted, killing the uneaten tissues which
turns brown. (this may be absent in exceptional cases where the egg is
laid well away from veins) Later the mine follows a tortuous course,
except when following a vein. The green frass (in fresh mines) is laid
arches and extends almost from edge to edge.
adults fly in two generations; during May and June and again in August.
Antwerpen, Zandvliet, 30 September 2007.
mine on Betula
with egg shell visible
(Photo © Chris Steeman)