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SPRUCE BEETLE (COLEOPTERA: SCOLYTIDAE) SURVIVAL IN STUMPS AND WINDFALL

Published online by Cambridge University Press:  31 May 2012

L. Safranyik  and
D.A. Linton
L. Safranyik
Affiliation:
Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Road,Victoria, British Columbia, Canada V8Z 1M5
D.A. Linton
Affiliation:
Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Road,Victoria, British Columbia, Canada V8Z 1M5
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Abstract

Survival of the spruce beetle, Dendroctonus rufipennis Kirby, from egg to adult, proportion of 1- and 2-year-cycle adults, and egg and egg gallery production per attack were investigated over five generations in stumps and windfall in central British Columbia. Densities of attacks, egg gallery lengths, and brood in various stages of development were obtained by repeated sampling throughout the life cycle. Spruce beetle populations remained at suboutbreak levels throughout the duration of the study. There were generally no differences by area, host type, or infestation year in any of the measured variables. The mean numbers (±SD) of eggs per attack and eggs per centimetre of egg gallery were 80.8 (54.3) and 5.4 (4.6), respectively. Brood survival from egg to adult averaged 6.8%. The lowest and highest survival from egg to adult occurred in the same years as when the lowest and highest percentage of 1-year-cycle adults were produced, respectively. On average, 51.8% of the beetles in stumps and 19.1% of beetles in windfall developed on a 1-year cycle.

Résumé

La survie du dendroctone de l’épinette, le Dendroctonus rufipennis Kirby, depuis l’oeuf jusqu’à l’âge adulte, ainsi que la proportion d’adultes présentant un cycle évolutif d’un an par rapport aux adultes montrant un cycle de deux ans et la production d’oeufs par attaque et d’oeufs par centimètre de galerie de ponte ont été étudiées durant une période couvrant cinq générations dans des souches et des chablis, dans le centre de la Colombie-Britannique. La densité des attaques, la longueur des galeries de ponte et le nombre d’oeufs et de larves à divers stades de développement ont été déterminés au moyen d’échantillonnages répétés durant toute la durée du cycle évolutif. Les populations du dendroctone de l’épinette sont demeurées au seuil sub-épidémique durant toute la durée de l’étude. De façon générale, pour toutes les variables à l’étude, aucune différence n’a été relevée entre les régions, le type d’hôte ou l’année d’infestation. Le nombre moyen (±écart-type) d’oeufs par attaque et d’oeufs par centimètre de galerie de ponte s’établissaient à respectivement 80,8 oeufs (54,3) et 5,4 oeufs (4,6). Le taux de survie moyen de l’oeuf à l’adulte était de 6,8%. Les taux de survie les plus faibles et les plus élevés depuis l’oeuf jusqu’à l’adulte ont été enregistrés au cours des mêmes années que les pourcentages les plus faibles et les plus élevés d’adultes issus d’un cycle évolutif d’un an. En moyenne, 51,8% des dendroctones dénombrés dans les souches et 19,1% de ceux trouvés dans les chablis ont présenté un cycle d’un an.

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 1 , February 1999 , pp. 107 - 113
Copyright
Copyright © Entomological Society of Canada 1999

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