Fir Tussock Moth
Common NameFir Tussock Moth
Scientific NameOrgyia pseudotsugata
FamilyErebidae
SubfamilyLymantriinae
Wingspan (mm)30
Primary Colorsbrown, tan, dark brown
HabitatConiferous forests, especially those with Douglas-fir, true firs, and spruces
Geographic RangeWestern North America, from British Columbia south to California and east to the Rocky Mountains
Host PlantsDouglas-fir, true firs, spruces, larch, ponderosa pine
Flight PeriodLate July to early September
Flight Styledarting
Conservation Statusleast-concern
Lifecycle NotesFemales are flightless and wingless, laying eggs on their cocoons. Larvae are distinctive, hairy caterpillars with prominent tufts of hair (tussocks) and red spots, known for defoliating conifers.
Identification TipsMales have mottled brown forewings and distinctive bipectinate (feathery) antennae. Females are wingless and resemble a furry grub. Larvae are easily identified by their colorful hair tufts and red spots.
Description
This is a male Fir Tussock Moth, characterized by its mottled brown and tan forewings, robust furry body, and prominent feathery antennae.
