Spindle ermine, Heesch, Netherlands

Tentative species. There's at least 3 similar Yponomeuta species in the country that are hard to tell apart visually. They are usually determined by their host plant. There's also minor differences in flight time. Based on flight time and this species reported 8 times more than the other candidates, Yponomeuta cagnagella is most likely, but definitely not 100% sure.