Scientific name: Digrammia triviata (Barnes & McDunnough)
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Geometridae

Distribution

British Columbia

This species is distributed throughout the host range in the interior of British Columbia south of 53⁰ latitude; it also extends to Washington.

Damage, symptoms and biology

Digrammia triviata is a relatively uncommon innocuous solitary defoliator.

Mature larva up to 26 mm long. Head, brown, white line over each lobe, frontal triangle black. This species has two distinct colour morphs. The dorsum of the more common rusty brown morph has a white I marking separating each abdominal segment and lateral white triangular markings. The less common grey morph has similar markings.

This species overwinters in the egg stage. Larvae are present from early July to early September, pupation occurs from mid-August to September, and adults emerge from late August to September.

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)

Digrammia triviata is restricted to Rocky Mountain juniper.

Main host(s)

Rocky Mountain juniper

Photos

Dion Manastyrski Centre de foresterie du Pacifique, Victoria (Colombie-Britannique) / Pacific Forestry Centre, Victoria, British Columbia

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