Appearance
The wingspan is 28–32 mm. The length of the forewings is 16–19 mm. Forewing with innumerable fine, slightly oblique, transverse striae, no distinct lines; the postmedian on both wings indicated by a thick dark fuscous shade posteriorly, distally to which there is an ill defined purplish blotch reaching to the hinder angle. Ab. "atrox" Zerny is a melanotic form, forewing mostly dark chestnut brown, towards the base and hinder angle black.Behavior
The moth flies in one generation from the beginning of May to mid-July.Food
The larva is twig like, brownish and variegated. The thorax is darker dorsally, there is a hump on the 5th abdominal and a transverse mark near the tail is also dark.The larva feeds on various deciduous trees such as oak, birch and sallow.
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