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Family Geometridae: Ennominae
Wingspan 30 - 38 mm
Phenology : Flight Period: Beginning of April to mid-August.
Adults are white with black markings on the margins of both wings. The black and white markings show considerable variation in the wild.may be disturbed during the day but is predominately a Night Flier
There is a rare form diluta in which the black is replaced by a yellow gold colour. This aberration is extremely rare and seldom encountered.
The larvae feed on sallow (Salix) and poplars (Populus), especially aspen (P. tremula). The larvae can be found in August and September on willow Salix spp., poplar Populus spp. and Hazel Corylus avellana. It overwinters as a pupa.
Habitat: Occupying woodland and moist localities associated with a variety of habits particularly heaths, bogs, and damp woodland.