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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

Amman, G. D. and Rasmussen, Lynn A.. 1974. Comparison of radiographic and bark-removal methods for sampling of mountain pine beetle populations. U.S. Dep. Agric. Forest Serv. Res. Pap. INT-151. 11 pp.Google Scholar
Atkins, M. D. 1966. Laboratory studies of the behaviour of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins. Can. Ent. 98: 953–991.CrossRefGoogle Scholar
Atkins, M. D. 1967. The effects of rearing temperature on the size and fat content of the Douglas-fir beetle. Can. Ent. 99: 181–187.CrossRefGoogle Scholar
Cole, W. E. 1973. Crowding effects among single-age larvae of the mountain pine beetle, Dendroctonus ponderosae (Coleoptera: Scolytidae). Environ. Ent. 2: 285–293.CrossRefGoogle Scholar
Hopkins, A. D. 1909. Practical information on the scolytid beetles of North America. I: Bark beetles of the genus Dendroctonus. U.S. Dep. Agric. Bur. Ent. Bull. 83.Google Scholar
McGhehey, J. H. 1971. Female size and egg production of the mountain pine beetle, Dendroctonus ponderosae Hopk. Nth. Forest Res. Centre Inf. Rep. NOR-X-9.Google Scholar
Reid, R. W. 1963. Biology of the mountain pine beetle, Dendroctonus monticolae Hopkins, in the East Kootenay Region of British Columbia. III. Interaction between the beetle and its host, with emphasis on brood mortality and survival. Can. Ent. 95: 225–238.CrossRefGoogle Scholar
Safranyik, L. and Jahren, R.. 1970 a. Emergence patterns of the mountain pine beetle from lodgepole pine. Dep. Fish. For. (Ottawa, Canada) Bi-mon. Res. Notes 26: 11–19.Google Scholar
Safranyik, L. and Jahren, R. 1970 b. Host characteristics, brood density and size of mountain pine beetles emerging from lodgepole pine. Dep. Fish. For.(Ottawa, Canada) Bi-mon. Res. Notes 26: 35–36.Google Scholar
Sømme, L. 1964. Effects of glycerol on cold-hardiness in insects. Can. J. Zool. 42: 87–101.CrossRefGoogle Scholar
Watson, J. A. 1971. Survival and fecundity of Dendroctonus ponderosae (Coleoptera: Scolytidae) after laboratory storage. Can. Ent. 103: 1381–1385.CrossRefGoogle Scholar