Robust Oak Moth
Common NameRobust Oak Moth
Scientific NameBiston robustum
FamilyGeometridae
SubfamilyEnnominae
Wingspan (mm)60
Wing Patterncryptic
Primary Colorsgrey, brown, white, black
HabitatForests, woodlands, urban parks, areas with host trees
Geographic RangeEast Asia (e.g., China, Korea, Japan, Russian Far East)
Host PlantsQuercus, Betula, Salix, Populus, Ulmus, Acer, Prunus
Flight PeriodMay to August
Flight Stylefluttering
Conservation Statusleast-concern
Lifecycle NotesUndergoes complete metamorphosis. Larvae are typically twig mimics, feeding on various deciduous tree leaves. Pupation occurs in the soil or leaf litter, and adults are nocturnal.
Identification TipsDistinguished by its large size for a geometrid, robust body, and the characteristic mottled grey-brown-white cryptic pattern on its broad wings, often with a distinct dark discal spot and wavy lines. Males have bipectinate antennae.
Description
A large, robust moth with broad, cryptically patterned wings in shades of grey, brown, and white, featuring irregular dark speckles and bands that provide excellent camouflage against tree bark.
