Thallophaga hyperborea (Hulst)
Damage, symptoms and biologyThallophaga hyperborea is a common innocuous solitary defoliator.
Mature larva up to 23 mm long. Head, mottled brown with cream stripes from vertex to labrum. Body, orange-brown with faint tan striping; creamy yellow subdorsal stripes extending onto head.
This species overwinters as a pupa buried in the soil. Adults emerge in April and May, larvae are present from May to August, and pupation occurs in late summer.
Life cycle (West 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.