Last modified: Jan. 29, 2020, 10:52 a.m.
An uncommon species in Belgium, mainly observed in the northern part.
See also bladmineerders.be
The larva mines the leaves of the foodplant, at first a gallery in which the frass is deposited in an irregular line in the middle. Later the larva changes to another leaf and causes a blotch. Sometimes several larvae occupy the same leaf, the blotches merge into one big blotch, occupying the entire leaf surface. When the larvae leave the mine, the leaf turns brownish.
Full-grown larvae pupate in a whitish cocoon attached to a leaf or to leaf litter on the ground, occasionally inside the mine.
The species hibernates in the adult stage. Adults hide in thatch, houses, hollows and other shelters.
One generation a year: from July, hibernating till late May of the next year.
Open areas in woodland, preferably shaded situations.