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SIZE- AND SEX-RELATED EMERGENCE, AND SURVIVAL IN COLD STORAGE, OF MOUNTAIN PINE BEETLE1 ADULTS

Published online by Cambridge University Press:  31 May 2012

L. Safranyik
L. Safranyik
Affiliation:
Pacific Forest Research Centre, Canadian Forestry Service, Victoria, British Columbia
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Abstract

Larvae of the mountain pine beetle, Dendroctonus ponderosae Hopk., were reared to adults in naturally infested bolts of lodgepole pine, Pinus conforta Dougl. var. latifolia Engelm., at 21 ± 3 °C. The mean pronotal width of the emerging beetles of both sexes decreased, and the male:female ratio increased, during the emergence period. On the average, larger individuals of both sexes survived longer when adult beetles were stored at 1 ± 2 °C. Also, the male:female ratio of the surviving beetles decreased with increased storage duration. These and related results in the literature suggest that in natural populations of the mountain pine beetle average adult size increases, and the male:female ratio decreases, following stress-induced mortality in the larval and(or) adult stages.

Résumé

Des larves du Dendroctone du Pin ponderosa, Dendroctonus ponderosae Hopk., furent élevés jusqu’à l’âge adulte dans des billes naturellement infestées de Pin tordu latifolié, Pinus conforta Dougl. var latifolia Engelm., à une température de 21 ± 3 °C. Lors de la période d’émergence, la largeur moyenne du pronotum des Dendroctones émergeants des deux sexes diminue et le rapport male : femelle augmente En moyenne, la survie des Dendroctones de plus grande taille des deux sexes est supérieure lorsqu’on entrepose les adultes à une température de 1 ± 2 °C. On note également une diminution dans le rapport male : femelle des Dendroctones survivants lorsqu’on augmente la durée de l’entreposage. Ces résultats et d’autres inclus dans la littérature scientifique suggèrent que la mortalité due au stress des populations naturelles de larves et d’adultes provoque des adultes de plus grande taille et diminue le rapport male:femelle.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 2 , February 1976 , pp. 209 - 212
Copyright
Copyright © Entomological Society of Canada 1976

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References

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