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Tolype dayi (Blackmore)

 - Dorso-lateral view of a mature larva, on a ponderosa pine
  • Latin name: Tolype dayi (Blackmore)
  • French name:
  • Order: Lepidoptera
  • Family: Lasiocampidae


British Columbia



Damage, symptoms and biology

Tolype dayi is a relatively uncommon innocuous solitary defoliator.

Mature larva up to 34 mm long. Head, grey with dark markings. Body, grey, mid-line of dorsum with dark diamond-like markings; transverse black and orange marking across dorsum of third thoracic segment; transverse black marking on dorsum of the fifth abdominal segment. Paired dorsal tubercles beset with long hairs on dorsum of each segment; hairy lobes along sides of body.

This species appears to overwinter in the egg stage. Larvae are present May to August; pupation occurs July to August and adults emerge August to September.

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)

Engelmann spruce, ponderosa pine, Rocky Mountain Douglas-fir, shore pine


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