Ontario, British Columbia
Damage, symptoms and biologyOn 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
Diet and feeding behaviour
: Feeds on the leaves of plants.
- Free-living defoliator: Feeds on and moves about freely on foliage.
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.