Appearance
The wingspan is 30–40 mm. Adults are on wing in midsummer.Forewing dark gray with black basal and anal margin dashes; postmedial line with sharply-dentate margin; hindwing white.
Naming
Acronicta grisea griseaAcronicta grisea revellata
Distribution
Coast to coast in southern Canada and northern United States.Food
Larvae feed on leaves of alder, apple, birch, elm, poplar, and willow.References:
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https://bugguide.net/node/view/27167