Last modified: Sept. 20, 2019, 2:39 p.m.
Although this species was considered as an uncommon species in Belgium, it is currently known from all provinces.
The bright yellow caterpillar has a black head..
The juvenile larva makes a small curved case of about 2 to 4 mm with a lot of frass grains attached to it. The mouth angle is then about 45° while a mature larva lives in a shining black pistol case of about 7 mm and has a mouth angle of 70°–80°.
See also bladmineerders.be.
The eggs are deposited on the underside of leafs. The young larvae, before hibernation, make tiny mines, sometimes dozens in one leaf. After hibernation, the caterpillars switch to window feeding and are fully grown by the end of May. The pupation takes place inside the case that is usually attached to the upper surface of a leaf. The adults come infrequently to light.
The adults fly in June and July.
The species lives especially Prunus spinosa but also on Prunus avium, Crataegus, Malus, Pyrus, Sorbus, Tilia, Alnus, Betula, Carpinus, Corylus, Quercus, Salix, etc...