Appearance
The wingspan is 40–60 mm.Female: Forewing greyish white dusted with dark, and bearing dark wavy transverse lines edged with pure white on the inner side. Hindwing white with indication of a dark submarginal band.Male: Forewing olive-grey, with black median area and darker indistinct slightly wavy transverse lines in the marginal and basal areas. Hindwing greyish yellow, with a transverse band which is slightly more distinct than in the female, and sometimes forms an elbowed anal. "juglandis" Hbn. denotes a form which is rather strongly divergent in the male, being distinguished by a greyish white head and thorax, as well as by a whitish basal area of the forewing. The median area is grey with blackish discocellular spot and marginal lines; hindwing with distinct dark submarginal band and discocellular spot. In the female the submarginal band of the hindwing is also more distinct than in typical specimens, ab. "concolor" Stgr. has dark grey forewing, unicolorous or with only traces of transverse lines.
Behavior
The moth flies from April to June.Egg light yellowish brown with dark median spot. Larva usually light lemon-yellow, but sometimes brownish yellow, violet or blackish grey, with deep black segmental incisions, lighter dorsal brushes and red or brown pencil on the 11th segment.The larvae feed on oak, willow, birch, "Prunus" and "Crataegus" species.
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