Hydriomena impluviata ([Denis & Schiffermüller], 1775)

Host plants:
The caterpillar lives on Alnus species (alder).

Habitat:
Hydriomena impluviata inhabits riparian forests with Alnus incana and A. glutinosa, alder swamps, but also smaller, planted alder occurrences in more humid forests.

Life cycle:
The pupa hibernates. The moths fly from late April to early or mid-July. The caterpillar is found mostly in the late summer from July to September, but should already to be detected earlier. I found some caterpillars at the eastern Swabian Alb (Germany) on a small, damp forest clearing with Molinia which was planted with gray alder (Alnus incana). The caterpillars live between loosely woven leaves.

Sometimes single moths of a partial second generation appear in the August/September.

Remarks:
Hydriomena impluviata occurs in Europe especially in the central and northern parts (in the south only locally) and reaches also Western Asia.