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TEMPERATURE-DEPENDENT DEVELOPMENT OF EGGS AND LARVAE OF CHORISTONEURA FUMIFERANA (CLEM.) (LEPIDOPTERA: TORTRICIDAE) AND SIMULATION OF ITS SEASONAL HISTORY

Published online by Cambridge University Press:  31 May 2012

Jacques Régnière
Jacques Régnière
Affiliation:
Laurentian Forestry Centre, Canadian Forestry Service, PO Box 3800, Sainte-Foy, Québec, Canada G1V 4C7
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Abstract

Relationships between temperature and development rates of eggs, overwintered second-instar larvae, and all larval stages of Choristoneura fumiferana (Clem.) fed on artificial diet were determined. Egg development was observed at eight constant temperatures between 7 and 32°C. It was fastest at 30°C, and showed relatively little variability. The rate of emergence of overwintered second-instar larvae was observed at 10 constant temperatures between 4 and 33°C. Maximum development rates occurred at 30°C. Variability in emergence rates was large, but unimodal. Development rates of the second to sixth larval instars were measured at 10 constant temperatures between 7 and 36°C, and maximum rates were observed, again, at 30°C. Variability in the development rates of the larvae was large, with no correlations between the development rates of the various larval instars. The results of computer simulations of the insect’s seasonal history are presented and discussed.

Résumé

Les relations entre la température et les taux de développement des oeufs, des larves hivernées ainsi que de tous les stades larvaires se nourrissant ont été déterminées pour Choristoneura fumiferana (Clem.), sur diète artificielle. Le développement des oeufs a été observé à huit températures constantes entre 7 et 32°C, était maximal à 30°C et a montré relativement peu de variabilité. L’émergence des larves diapausées de deuxième stade a été observée à 10 températures constantes entre 4 et 33°C, et se faisait en un minimum de temps à 30°C. La variation du taux de développement d’émergence était grande, mais unimodale. Le développement des larves des deuxième au sixième stades fut observé à 10 températures constantes entre 7 et 36°C, avec, encore, les taux les plus rapides à 30°C. La variabilité des taux de développement était élevée à tous les stades larvaires, et aucune corrélation n’a été trouvée entre les taux de développement des divers stades. Les résultats de simulations par ordinateur, de la biologie saisonnière de l’insecte sont présentés et discutés.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 7-8 , August 1987 , pp. 717 - 728
Copyright
Copyright © Entomological Society of Canada 1987

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