Fir needle inchworm
This holarctic species is generally distributed throughout British Columbia; it also occurs east to Newfoundland and in Eurasia.
Damage, symptoms and biology
Eupithecia lariciata is a common innocuous solitary defoliator.
Mature larva up to 24 mm long. Head, light brown with cream coloured markings. Body light rusty brown; middorsal line alternatively dark then faint; faint creamy yellow subdorsal line and spiracular line.
This species overwinters as a pupa in litter or soil. Adults emerge in May and lay eggs on needles. Larvae are present from mid-June to early August and pupation occurs from July to August.
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 hosts of Eupithecia lariciata are Douglas-fir, Engelmann spruce, white spruce, subalpine fir and western larch; other hosts include tamarack and black spruce.