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  • J.J. Turgeon (a1), N. Nelson (a1) and E.G. Kettela (a2)

Studies on the reproductive biology of the spruce budmoth, Zeiraphera canadensis Mut. & Free., were conducted in northern New Brunswick. Observations of adults under insectary conditions revealed that peak mating occurred around midnight, and that copulation lasted on average 4.3 h. The age of males and females at mating as well as their longevity is provided for both years. The pre-oviposition period was similar for both years, 6.1 and 6.3 days in 1984 and 1985, respectively. The oviposition period decreased from 6.1 days in 1984 to 4.4 days in 1985. The total fecundity was 32.9 eggs per female in 1984 and 21.8 eggs per female in 1985. The mean age-specific oviposition rate under 1984 field conditions is also presented. The importance of these results in determining the proper timing of adulticidal sprays against Z. canadensis is discussed.

La stratégie de reproduction de la tordeuse de l’épinette, Zeiraphera canadensis Mut. & Free., a été étudiée dans le nord du Nouveau Brunswick. La période optimale d’accouplement d’adultes en cages, survint aux environs de minuit. L’accouplement moyen dura 4,3 h. La période de pré-accouplement et la longévité des femelles et des mâles furent obtenus pour les 2 années d’études. En moyenne, la ponte débuta, 6,1 et 6,3 jours, en 1984 et 1985 respectivement, après l’émergence des femelles. La période de ponte passa de 6,1 jours en 1984 à 4,4 jours en 1985. Le nombre moyen d’oeufs pondus fut de 32,9 oeufs par femelle en 1984 et de 21,8 oeufs par femelle en 1985. La relation obtenue en 1984, entre la ponte journalière moyenne et l’âge des femelles, est présentée. Notre discussion porte sur la détermination d’un moment opportun pour l’application d’un insecticide contre les adultes de Z. canadensis.

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Holmes, J.A., and Osgood, E.A.. 1984. Chemical control of the spruce budmoth, Zeiraphera canadensis Mut. & Free., (Lepidoptera: Olethreutidae) on white spruce in Maine. Univ. Maine Orono, Maine Agric. Exp. Stn. Tech. Bull. 112. 21 pp.
MacAndrews, A.H. 1927. Biological notes on Zeiraphera fortunana Kft, and ratzerburgiana Ratz. (Eucosmidae: Lepid.). Can. Ent. 59: 2729.
Pilon, J.G. 1965. Bionomics of the spruce budmoth Zeiraphera ratzerburgiana (Ratz.) (Lepidoptera: Olethreutidae). Phytoprotection 46: 513.
Turgeon, J.J. 1985. Life cycle and behavior of the spruce budmoth, Zeiraphera canadensis (Lepidoptera: Olethreutidae) in New Brunswick. Can. Ent. 117: 12391247.
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The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
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