Quebec, Ontario, British Columbia
This species is generally distributed throughout the southern interior of British Columbia; it also occurs east to Nova Scotia and south to Florida.
Damage, symptoms and biology
Tetracis cachexiata is a relatively uncommon innocuous solitary defoliator.
Mature larva up to 45 mm long. Head, small, flattened, dull yellowish white with dark markings. Body, brown to grey and variously marked with repeating middorsal hourglass pattern. Body slim, wider from segments 6-9. Second thoracic segment with a pair of large angular lateral swellings and small addorsal tubercles. Both abdominal segments 4 and 5 have a pair of subdorsal tubercles.
Larvae are present from early June to late September. Pupation occurs from July to mid-August, and adults emerge in September or May.
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)
Coniferous hosts of Tetracis cachexiata primarily include Douglas-fir, tamarack and white spruce; other hosts include white birch, trembling aspen and willow.
Balsam fir, balsam willow, Bebb willow, black willow, Douglas-fir, feltleaf willow, golden weeping willow, heartleaf willow, hooker willow, hybrid white willow, laurel willow, littletree willow, Mackenzie willow, meadow willow, Pacific willow, peachleaf willow, pussy willow, red maple, Rocky Mountain Douglas-fir, sandbar willow, satiny willow, Scouler willow, shining willow, silver maple, Sitka willow, tamarack, trembling aspen, violet willow, white birch, white spruce, white spruce, willow
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