Identification: Similar to Orgyia definita. Females of these species can only be distinguished by identifying associated males. Wings usually grayer in male of this species median area usually paler. Blackish patch near apex smaller, with no light streaks below it. White spot accents lower st. line, as in male Orgyia definita.
Wing Span: 2.5-3.5 cm (male). Female lacks wings.
Life History: Sometimes a pest on Christmas tree plantations northward in its range.
Flight: June-November (2 broods usually June-August and August-November). One brood (August-October) in far northeastern range.
Caterpillar Hosts: Over 140 known hosts, including alder, apple, balsam fir, birches, and larch.