Last modified: Aug. 28, 2020, 3:48 p.m.
This species in not so common in Belgium but is probably often overlooked.
This species constructs a blotch mine that starts near a leaf margin. Often there are several caterpillars per leaf, each one starting its own mine but these soon merge into one large mine that can cover a complete leaf.
See also bladmineerders.be
Pupation takes place in a hard silk cocoon.
The eggs are deposited in the leaf-buds. The larva lives in a blotch mine in Betula-leaves that starts near the leaf margin. Often there are a few caterpillars per leaf and each one starts its own mine but these soon merge into one large mine that can cover a complete leaf. Mature larvae leave their mines and pupate in the ground in a hard silk cocoon. The adults can be observed resting on trees or flying around trees in sunshine. They occasionally come to light.
The adults fly in April and early May.
The larvae feed monophagously on Betula spp.