Damage, symptoms and biologyThe saddleback looper is a common and occasionally destructive solitary defoliator.
Mature larva to 35 mm long. Head, pale mottled with rust, vertex moderately cleft. Body, grey to brown marked with black, brown and pale areas. Dorsum of second thoracic segment slightly raised. Faint broken cream colored middorsal line; broken subdorsal double black lines; prominent dark chevron on dorsum of second abdominal segment and dark U marking on dorsum of eighth abdominal segment.
This species overwinters as a pupa buried in the duff. Adults emerge in May, mate and lay eggs in groups of 10 to 20 in bark crevices and under moss on tree boles. Larvae are present from June to August; pupation occurs from August to September.
Life cycle (East of the Rockies)
Canadian Forest Service Publications
Diet and feeding behaviour
: Feeds on the leaves of plants.
- Free-living defoliator: Feeds on and moves about freely on foliage.