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HOST EFFECTS ON THE PHENOLOGY, DEVELOPMENT, AND MORTALITY OF FIELD POPULATIONS OF THE MOUNTAIN PINE BEETLE, DENDROCTONUS PONDEROSAE HOPKINS (COLEOPTERA: SCOLYTIDAE)

Published online by Cambridge University Press:  31 May 2012

David W. Langor
David W. Langor
Affiliation:
Department of Entomology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3
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Abstract

Phenology, fecundity, development, and mortality were studied for co-occurring, declining populations of Dendroctonus ponderosae Hopkins in limber pine and lodgepole pine at two sites in the Porcupine Hills of southwestern Alberta in 1985–1986. Beetles reared in lodgepole pine emerged and attacked new hosts 7–8 days earlier than those in limber pine in 1985. Beetles were able to utilize over two-thirds of the length of each limber pine bole but only about one-third of the length of each lodgepole pine bole. Also, beetles infesting limber pine had significantly higher fecundity, produced more eggs per centimetre of gallery length, and their progeny developed faster and survived better than beetles infesting lodgepole pine. There was no apparent phenological or other barrier that might inhibit gene flow between D. ponderosae populations in limber pine and lodgepole pine. In the area studied, limber pine was a better host for D. ponderosae reproduction, development, and survival than was lodgepole pine. Thus, beetle populations may be able to increase much more quickly in limber pine, arguing for regular monitoring of these populations.

Résumé

On a étudié la phénologie, la fécondité, le développement et la mortalité de deux populations coexistantes en déclin de Dendroctonus ponderosae Hopkins sur le pin souple et le pin lodgepole de deux localités des Monts Porcupine au sud-ouest de l’Alberta en 1985–1986. Les dendroctones obtenus du pin lodgepole ont émergé et attaqué de nouveaux hôtes 7–8 jours plus tôt que ceux obtenus du pin souple en 1985. Les insectes ont pu utiliser plus des deux tiers de la longueur des bûches du pin souple mais un tiers seulement des bûches du pin lodgepole. De plus les insectes provenant du pin souple avaient une fécondité plus élevée et ont déposé plus d’oeufs par centimetre de galerie; et leurs progénitures se sont développées plus vite et étaient plus viables que celles des individus élevés sur pin lodgepole. Il n’y a apparemment aucune barrière phénologique ou autre pouvant limiter l’échange de gènes entre les populations du dendroctone issues des deux espèces de pin. Dans la région d’étude, le pin souple s’est avéré un hôte supérieur pour la reproduction, le développement et la survie de D. ponderosae, au pin lodgepole. Ainsi, les populations de l’insecte auront tendance à augmenter beaucoup plus vite sur le pin souple et devraient donc être dépistées régulièrement.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 2 , February 1989 , pp. 149 - 157
Copyright
Copyright © Entomological Society of Canada 1989

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