Hydrelia blomeri (Curtis, 1832)

Host plants:
The caterpillar lives on elm (Ulmus glabra). I found them on the northern slopes of the eastern Swabian Alb together with the caterpillars of Abraxas sylvata.

Habitat:
Hydrelia blomeri inhabits shady, humid places in ravine forests, hillside forests and occasionally in other woodland areas.

Life cycle:
The pupa hibernates. The moths fly from May to August, especially in late June and July, probably in only one generation. The caterpillars are found particularly from July to September with peak in late August and early September. They usually sit on the underside of leaves on very shady, young elm.

Endangerment: endangered

Endangerment factors:
Hydrelia blomeri is endangered for several reasons. First, the intensification in silviculture with dense monocultures and intensive care alongside other interventions (roads) is the cause of the decline of suitable sites. Secondly, the constantly flickering elm disease has decreased the host plant supply in many places.

Remarks:
Hydrelia blomeri is distributed locally from Britain and France across Central Europe and temperate Asia. In Europe, the moth is missing in the south and also in Northern Scandinavia.