The spruce budworm, Choristoneura fumiferana (Lepidoptera: Tortricidae), in British Columbia

T. L. Shore, R. I. Alfaro


The spruce budworm, <i>Choristoneura fumiferana</i> (Clements), causes severe defoliation, primarily of white spruce, <i>Picea glauca</i> (Moench) Voss, eastern larch, <i>Larix laricina</i> (Du roi), K. Koch, and alpine fir, <i>Abies lasiocarpa</i> (Hook.) Nutt, in the Liard River area of northern British Columbia. Less preferred hosts are black spruce, <i>Picea mariana</i> (Mill.) B.S.P., and lodgepole pine, <i>Pinus contorta</i> Doug]. Infestations last for many years with variable defoliation intensity. Defoliation causes extensive top-killing of trees but little mortality. In addition, mature spruce trees (104 to 144 years old) defoliated from 1959 to 1976 lost an estimated 3 to 4.4% of diameter growth. Tree ring analysis suggested that <i>C. fumiferana</i> defoliated trees in the Liard River area at least five times since 1869. Infestations recurred every 14 to 28 years.


spruce budworm; <i>Choristoneura fumiferana</i>; Lepidoptera; Tortricidae; white spruce; <i>Picea glauca</i>; eastern larch; <i>Larix laricina</i>; alpine fir; <i>Abies lasiocarpa</i>; <i>Picea mariana</i>; <i>Pinus contort

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