Canadian Forest Service Publications

Parasitism in sustained and collapsing populations on the jack pine budworm, Choristoneura pinus pinus free. (Lepidoptera: Tortricidae), in Ontario, 1985-1987. 1991. Nealis, V.G. The Canadian Entomologist 123: 1065-1075.

Year: 1991

Available from: Great Lakes Forestry Centre

Catalog ID: 21553

Language: English

CFS Availability: PDF (request by e-mail)

Abstract

Sixteen species of parasitoids were found attacking outbreak and collapsing populations of the jack pine budworm, Choristoneura pinus pinus free. (Lepidoptera: Tortricidae), in several plots in northeastern and northwestern Ontario. The patterns of parasitism were similar among widely separated plots with only a few species consistently dominating the parasitoid fauna. The greatest difference in the pattern of parasitism was between sustained and collapsing infestations. Collapsing populations of jack pine budworm were associated with relatively high levels of parasitism by Meteorus trachynotus Vier. (Hymenoptera: Braconidae) and Lypha setifacies (West.) (Diptera: Tachinidae) which attacked the late larval stages of the budworm. The results are discussed in comparison with other jack pine budwrom studies and with spruce budworm population studies.

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