Epinotia bilunana (Haworth, 1811)
the larva, a caterpillar, lives during the summer in a female catkin, that may become somewhat disfigured, and finally is eaten out completey. The larve hibernates in the catkin and in spring pupates either there, or in the litter.
Betula pendula, pubescens.
Bradley, Tremewan & Smith (1973), Buhr (1964a), Szőcs (1977a).