Larch pug moth

Larch pug moth -

Latin name: Eupithecia annulata (Hulst)
French name: No french name
Order: Lepidoptera
Family: Geometridae

Distribution

British Columbia, Newfoundland, Ontario, Yukon

Generally distributed throughout British Columbia; it also occurs north to the Yukon, east to Newfoundland and Labrador, and south to California and Colorado.

Micro-habitat(s)

Needle

Damage, symptoms and biology

Eupithecia annulata is a common innocuous solitary defoliator.

Mature larva up to 22 mm long. This species has two distinct morphs. The more common morph has both a green variant (more common) and a brown variant. The green variant has a green head and body with a middorsal dark green pinstripe and irregular yellow lateral stripe. The brown variant is similarly marked. The less common morph has a greenish brown, reddish brown or yellowish brown head and body; the dorsum is marked with a prominent dark arrowhead pattern, dark triangular subdorsal markings and irregular yellow lateral stripe.

This species overwinters in the pupal stage. Adults emerge from April to June; larvae are present from May to August and pupation occurs from July to August.

Canadian Forest Service Publications

Larch pug moth

Diet and feeding behaviour

  • Phyllophagous: Feeds on the leaves of plants.
    • Free-living defoliator: Feeds on and moves about freely on foliage.
The principal hosts of Eupithecia annulata are Douglas-fir and western hemlock; other hosts include grand fir, amabilis fir, subalpine fir, Engelmann spruce, white spruce, Sitka spruce, western redcedar and mountain hemlock.

Main host(s)

Douglas-fir, Engelmann spruce, Rocky Mountain Douglas-fir, western hemlock, white spruce

Secondary host(s)

Amabilis fir, balsam fir, black spruce, Engelmann spruce, Garry oak, grand fir, lodgepole pine, mountain hemlock, Sitka spruce, subalpine fir, subalpine fir, western larch, western redcedar, western white pine, white spruce