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REPRODUCTION AND DEVELOPMENT OF THE EASTERN LARCH BEETLE, DENDROCTONUS SIMPLEX LECONTE (COLEOPTERA: SCOLYTIDAE), IN NEWFOUNDLAND

Published online by Cambridge University Press:  31 May 2012

David W. Langor  and
Arthur G. Raske
David W. Langor
Affiliation:
Biology Department, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9
Arthur G. Raske
Affiliation:
Canadian Forestry Service, Newfoundland Forestry Center, PO Box 6028, St. John's, Newfoundland, Canada A1C 5X8
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Abstract

Overwintered adults of Dendroctorms simplex LeConte emerged in May and June and produced one generation and two broods in 1983 and 1984. Egg galleries were vertical, slightly sinuous, and significantly longer in first brood trees than in second brood trees . Females laid zero to four eggs per niche . The average number of eggs per gallery was significantly higher in first brood trees (48) than in second brood trees (31). Mean number of eggs per centimetre of gallery was 1.2 for both broods. Mean brood density was significantly higher in first brood trees (50 individuals per 100 cm2) than in second brood trees (23 per 100 cm2).

Dendroctonus simplex has four larval instars. Development from egg to adult in the field averaged 60 and 70 days for first and second broods, respectively. Total development at 12, 18, and 24°C in the laboratory averaged 80, 42, and 39 days, respectively. Adult males were significantly smaller than females.

Résumé

Les adultes hivernants de Dendroctonus simplex LeConte ont émergé en mai et en juin, et ont produit une génération et deux couvées en 1983 et 1984. Les galeries de ponte étaient verticales, légèrement sinueuses et significativement plus longues dans les arbres porteurs de première couvée (42 cm) que dans ceux de deuxième couvée (26 cm). Les femelles ont pondu de zéro à quatre oeufs par niche, en moyenne 1,4. Le nombre moyen d’oeufs par galerie était significativement plus élevé dans les arbres de première couvée (48) que dans ceux de la deuxième (31). Le nombre moyen d’oeufs par centimetre de galerie fût de 1,2 pour les deux couvées. La denisté moyenne des couvées était significativement plus grande dans les arbres de première couvée (50 individus/100 cm2) que dans ceux de deuxième couvée (23/100 cm2).

Dendroctonus simplex passe par quatre stades larvaires. Le développement de l’oeuf à l’adulte en nature dure en moyenne 60 et 70 jours, pour la première et la deuxième couvée. Le développement entier à 12, 18 et 24°C au laboratoire a duré 80, 42 et 309 jours. Les mâles adultes étaient significativement plus petits que les femelles.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 11 , November 1987 , pp. 985 - 992
Copyright
Copyright © Entomological Society of Canada 1987

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