Drymonia querna ([Denis & Schiffermüller], 1775)

Host plants:
The caterpillars feed on oak (Quercus).

Habitat:
Drymonia querna inhabits warm and often also dry oak-rich woodlands and scrub more in the lowlands.

Life cycle:
The pupa hibernates and the moths are on the wing in one or two generations between May and August. In cool years or regions the single generation is on the wing especially in June/July. The larvae are recorded in June/July and again in August/September, with one generation more in July and August. I observed a fully-grown larva together with an egg of Marumba quercus in N-Spain (Lleida, moth without hibernation) in late July 2013. In Stuttgart Drymonia querna also occurs in old oak woodland without young oaks.

Endangerment factors:
Drymonia querna is endangered north of the Alps because warm open oak woodland is in decline there due to often profit-maximizing forestry and other factors.

Remarks:
Drymonia querna occurs in southern and central Europe and western Asia.