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Argyrotaenia dorsalana (Dyar)

  • Latin name: Argyrotaenia dorsalana (Dyar)
  • French name:
  • Order: Lepidoptera
  • Family: Tortricidae


British Columbia

This species occurs on the south coast and in the southern interior of British Columbia south of 510 latitude; it also extends to California and Utah.



Damage, symptoms and biology

Argyrotaenia dorsalana is a common innocuous solitary defoliator.

Mature larva up to 17 mm long. Head, yellowish green with black triangular lateral marking. Body, yellowish green, dark green middorsal pin stripe; dorsum of each abdominal segment marked with two pairs of faint yellow spots.

This species appears to overwinter in the egg stage. Larvae are present from early May to mid-June; pupation occurs in late June and adults emerge soon after.

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)

The principal host of Argyrotaenia dorsalana is Douglas-fir; other hosts include western hemlock and western redcedar.

Main host(s)

Douglas-fir, Rocky Mountain Douglas-fir, western hemlock, western larch

Secondary host(s)

Grand fir, ponderosa pine, spruces


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