Canadian Forest Service Publications
The number of instars in jack pine budworm,Choristoneura pinus pinus Free. (Lepidoptera: Tortricidae), and the effect of parasitism on head capsule width and development time. 1987. Nealis, V.G. The Canadian Entomologist 119: 773-777.
Available from: Great Lakes Forestry Centre
Catalog ID: 21543
CFS Availability: PDF (request by e-mail)
The larvae of jack pine budworm, Choristoneura pinus pinus Free., were reared individually on diet in the laboratory. Observation of ecdysis and measurement of the corresponding head capsules identified seven distinct instars. Parasitism by the common larval parasitoid Apanteles fumiferanae Vier. resulted in smaller head capsule size and retarded development during the fourth, fifth, and sixth instars of the jack pine budworm.
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