Host plants:
The larvae mostly feed on Quercus species, besides also on other deciduous woods.
Habitat:
Orthosia cruda inhabits oak-rich forests, parks, and other woody locations.
Life cycle:
The adults overwinter in the pupal skin and emerge in March or April. The caterpillars occur in a brown and a green version. I tapped them in May and June from oaks.
Endangerment factors:
Orthosia cruda is widespread, but loses many habitats due to the decline of oaks in Central Europe.
Remarks:
Orthosia cruda is distributed from the Iberian Peninsula to West Asia.