Appearance
The wingspan is 40–45 mm. The forewings are light grey with black speckling, often with shades of brown along the costa and apex. Adults are on wing from April to June in one generation per year.Food
The larvae feed on ''Pseudotsuga'', ''Pinus'', ''Populus'' and ''Salix'' species. They are dark with an intricate pattern of black and brown, resembling tree bark or a twig. The species overwinters in the pupal stage within a cocoon in leaf litter.References:
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