Tethea or (Denis & Schiffermüller, 1775)

Host plants:
The caterpillar feeds on Populus species (poplar), especially Populus tremula.

Habitat:
Tethea or prefers slightly moist to wet forests, bushy areas and clearcuttings with aspen groups.

Life cycle:
The moths fly from late April to mid-September in two generations. At higher altitudes or cooler areas only a single generation occurs from May to early August. The caterpillars live mainly from June to early October between two leaves that are spun together. The pupa overwinters.

Remarks:
Tethea or occurs from Northern Spain across large parts of Europe (except in the extreme north and south) and temperate Asia to Japan.