Thallophaga hyperborea (Hulst)

 - Dorso-lateral view of a mature larva, on Sitka spruce
  • Latin name: Thallophaga hyperborea (Hulst)
  • French name:
  • Order: Lepidoptera
  • Family: Geometridae


British Columbia



Damage, symptoms and biology

Thallophaga 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)

Life cycle (West of the Rockies)
Stage/Month J F M A M J J A S O N D

Canadian Forest Service Publications

Diet and feeding behaviour

  • Phyllophagous : Feeds on the leaves of plants.
    • Free-living defoliator: Feeds on and moves about freely on foliage.
Information on host(s)

Main host(s)

Amabilis fir, Engelmann spruce, grand fir, mountain hemlock, Rocky Mountain Douglas-fir, Sitka spruce, subalpine fir, western hemlock, western redcedar, white spruce

  • Dorso-lateral view of a mature larva, on Sitka spruce
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