Pupae occur in July and August, usually inside light silken cocoons in crevices of the bark. Both male and female adults are good fliers, they are active at night and are attracted to lights. The males can be captured in pheromone traps. Grows to 30-35 mm. Head is pale brown with dense black markings.
Body is greyish yellow to yellow, with black hair tufts and a black dorsal band.
A melanic grey-brown form of the male is also known to occur. A.M. Pucat', D. E. Watler and R.Favrin, Plant Health Risk Assessment Unit.