Eriogaster arbusculae

Eriogaster arbusculae is a moth in the family Lasiocampidae first described by Christian Friedrich Freyer in 1849. It is found in parts of the Alps and mountainous areas of Fennoscandia.

The wingspan for adults is 31–35 mm for males and 36–43 mm for females. The ground colour of the forewings is dark reddish brown to greyish brown. The hindwings are lighter. There is one generation per year with adults on wing from April to July.

The larvae feed on the leaves of Vaccinium myrtillus, Vaccinium uliginosum, Betula, Salix and Alnus species. Larvae can be found from June to August. Pupation takes place in a cocoon. The species overwinters in the pupal stage. It may overwinter multiple years.