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EGG GALLERY, BROOD PRODUCTION, AND ADULT CHARACTERISTICS OF MOUNTAIN PINE BEETLE, DENDROCTONUS PONDEROSAE HOPKINS (COLEOPTERA: SCOLYTIDAE), IN THREE PINE HOSTS

Published online by Cambridge University Press:  31 May 2012

H.F. Cerezke
H.F. Cerezke
Affiliation:
Canada Department of Natural Resources, Canadian Forest Service, 5320-122 Street, Edmonton, Alberta, Canada T6H 3S5
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Abstract

During the 1977–1986 outbreak of mountain pine beetle (Dendroctonus ponderosae) in southwestern Alberta and Saskatchewan, populations of this beetle developed in lodgepole pine and limber pine stands, and threatened to spread northeasterly to the extensive jack pine forests in the central parts of the two provinces. To assess jack pine as a potential new breeding host, I compare egg galleries, brood production, and adult characteristics of D. ponderosae reared in lodgepole, limber, and jack pine logs. Brood productivity, beetle size, sex ratios, and egg gallery characteristics are described for beetle populations reared from naturally infested limber pine logs from southwestern Alberta, and from artificially infested jack pine logs from east-central Alberta and central Saskatchewan. In a field experiment where logs of the three hosts were placed together, adult beetles and their gallery characteristics are described and compared on the three hosts. The results confirm that jack pine is a viable host, that D. ponderosae’s attack characteristics, survival, and progeny on jack pine all appear comparable to those characters observed for beetles reared on lodgepole pine, and that limber pine is highly productive of beetle brood.

Résumé

Durant l’infestation du Dendroctone du pin ponderosa (Dendroctonusponderosae) dans le sud-ouest de l’Alberta et de la Saskatchewan, au cours de la période 1977–1986, des populations se sont formées dans les forêts de pins vrillés et de pins souples et l’insecte menaçait les grandes forêts de pins gris du centre de ces provinces. Pour évaluer la sensibilité du pin gris aux invasions de ce parasite, j’ai comparé les galeries de ponte, la production d’oeufs et les caractéristiques des adultes de D. ponderosae élevés dans du bois de pin vrillé, de pin souple et de pin gris. On trouvera ici une description de la production d’oeufs, de la taille des scolytes, des rapports mâles : femelles et des caractéristiques des galeries de ponte chez des populations naturelles provenant de pins souples du sud-ouest de l’Alberta et chez des populations introduites artificiellement dans des pins gris dans le centre-est de l’Alberta et le centre de la Saskatchewan. On trouvera également la description des caractéristiques des scolytes adultes et de leurs galeries de ponte au cours d’une expérience en nature où les trois types de pins ont été réunis. Les résultats confirment que le pin gris constitue un hôte approprié, que les caractéristiques des infestations, de la survie et de la progéniture des scolytes sur le pin gris sont comparables aux mêmes caractéristiques chez les scolytes des populations parasites du pin vrillé et enfin que le pin souple permet le développement de populations très productives du scolyte.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 6 , December 1995 , pp. 955 - 965
Copyright
Copyright © Entomological Society of Canada 1995

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