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.
Issued by: Great Lakes Forestry Centre
Catalog ID: 21553
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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.