not so common species in Belgium.
young larva makes a small circular blotch mine in the leaves of Alnus, Betula, Corylus, Acer, Carpinus, Cornus, Malus, Prunus, Pyrus, Sorbus and Tilia. Then
it falls to the ground in a case cut from the blotch. The caterpillar then eats withered leaves. It hibernates
fully-fed in that case. Pupation in the case, normally attached vertical among a base of a tree trunk.
adults fly from mid April till the end of May in one generation a year. The moths are active
during the day and later come to light.
Namur, Lessive, 21 October 2007.
excision of mine on leaf of Alnus
(Photo © Chris Snyers)