Betula pubescens
The larvae feed on "Betula humilis", "Betula nana", "Betula pendula" and "Betula pubescens" (including "Betula pubescens carpatica"). They mine the leaves of their host plant. The mine consists of a slender corridor that hardly widens. The first part is filled with frass. The mine mostly follows a vein over a long distance, but the larva is capable of crossing thick veins, even the midrib.