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ENVIRONMENTAL AND GENETIC EFFECTS ON MEAN EGG WEIGHT IN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

G. T. Harvey
G. T. Harvey
Affiliation:
Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste. Marie, Ontario P6A 5M7
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Abstract

Laboratory studies of the mean weights of initial eggs (Ei) of the spruce budworm, Choristoneura fumiferana (Clem.), show that this value is determined by the genetic constitution of the female moth and is relatively independent of environmental control. Dietary differences experienced by the female during larval development, and originating from different hosts or from reduced nutrient levels in artificial diets, did not affect Ei values; however, depletion of nutrients sufficient to reduce fertility greatly did reduce Ei. Temperature conditions during the ultimate larval and pupal stages influence Ei values which vary inversely. Mean egg weights are strongly heritable and are readily selected for, thereby demonstrating the presence of strong genetic control.

Résumé

L'étude en laboratoire de la masse moyenne des oeufs initiaux (Ei) de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clem.), montre que sa valeur est déterminée par le bagage génétique de la femelle et qu'elle est relativement indépendante du milieu. Le régime alimentaire de la femelle au cours de sa période larvaire, qui peut différer selon l'hôte ou selon les carences introduites artificiellement, n'a pas modifié Ei; toutefois, des carences suffisantes pour réduire la fertilité ont grandement réduit Ei. La température au cours du dernier stade larvaire et du stade de la chrysalide ont influé sur Ei de façon inversement proportionnelle. La masse moyenne des oeufs est fortement héritable et fait d'emblée l'objet d'une sélection, ce qui montre l'effet d'un puissant déterminisme génétique.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1109 - 1117
Copyright
Copyright © Entomological Society of Canada 1983

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