Language selection

Government of Canada / Gouvernement du Canada

Search

Great brocade

Robert W. Duncan Centre de foresterie du Pacifique, Victoria (Colombie-Britannique) / Pacific Forestry Centre, Victoria, British Columbia

Distribution

Ontario, British Columbia

This holarctic species occurs throughout British Columbia; it also occurs throughout much of North America south to New Jersey and Colorado, Greenland, Europe and across Siberia to China and Japan.

Damage, symptoms and biology

On conifers, Eurois occultais an innocuous solitary defoliator.

Mature larvae up to 35 mm long. Head, creamy yellow with dark reticulation and prominent middorsal and subdorsal black stripes. Body, yellowish brown with pair of prominent black triangular markings on dorsum of abdominal segments 7-8. Spiracular stripe thin yellow with broad cream coloured subspiracular stripe below.

This species is single brooded and overwinters as a partly grown larva. Larvae are present from April to June and pupation occurs June to July. Adults are in flight from July to September.

Canadian Forest Service Publications

Great brocade

Information on host(s)

The principal coniferous hosts of Eurois occulta include western redcedar, eastern white-cedar and larch; other hosts include snowberry, blueberry and sweet gale.

Main host(s)

Blueberry, eastern white-cedar, snowberry, sweet Gale, tamarack, western redcedar

Photos

Robert W. Duncan Centre de foresterie du Pacifique, Victoria (Colombie-Britannique) / Pacific Forestry Centre, Victoria, British Columbia

Robert W. Duncan Centre de foresterie du Pacifique, Victoria (Colombie-Britannique) / Pacific Forestry Centre, Victoria, British Columbia