Photo © Lukas Large
Synanthedon spheciformis, the white-barred clearwing, is a moth of the family Sesiidae. It is found in Europe and Siberia.
The wingspan is 26–31 mm. The length of the forewings is 12–14 mm. The moth flies from May to June depending on the location.
The larvae feed on alder and birch. They bore the stem of their host plant.
Source: Wikipedia
The primary larval foodplants are Alder (Alnus glutinosa) and birches (Betula spp.).