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DIFFERENTIAL MORTALITY BETWEEN MALE AND FEMALE CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE) LARVAE EXPOSED TO A BACULOVIRUS WITH OR WITHOUT OPTICAL BRIGHTENERS

Published online by Cambridge University Press:  31 May 2012

S.Y. Li  and
I.S. Otvos
S.Y. Li
Affiliation:
Pacific Forestry Centre, Canadian Forest Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
I.S. Otvos
Affiliation:
Pacific Forestry Centre, Canadian Forest Service, Natural Resources Canada, 506 West Burnside Road, Victoria, British Columbia, Canada V8Z 1M5
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Abstract

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Fifth-instar larval mortality was compared between male and female Choristoneura occidentalis Freeman exposed in the laboratory to sublethal doses of Choristoneura fumiferana (Clem.) multicapsid nuclear polyhedrosis virus (CfMNPV) with or without optical brighteners. More females than males died when the virus was used alone, but differences were not significant. When 1% brightener was added to CfMNPV suspension, differences in larval mortality between males and females were significant for three of the four brighteners tested. In addition, times at which 50% of the larvae died indicated that female larvae died 23 and 39% more quickly than male larvae, respectively, when brightener Blankophor HRS and Tinopal LPW were added to the virus, whereas at times at which 95% of the larvae died indicated that females died 33 and 54% faster than males. Alteration of sex ratio favoring male survival can play a significant role in the biological control of C. occidentalis by the virus.

Résumé

La mortalité des larves de cinquième stade a été comparée chez des mâles et des femelles de Choristoneura occidentalis Freeman exposées en laboratoire à des doses sublétales du virus responsable de la polyhédrose nucléaire chez Choristoneura fumiferana, le CfMNPV, en présence ou en l’absence de décolorants optiques. La mortalité a atteint plus de femelles que de mâles en présence du virus seul, mais les différences n’étaient pas significatives. À l’addition de 1% de décolorant optique à la suspension de virus, les différences entre la mortalité des larves mâles et celle des larves femelles sont devenues significatives pour trois des quatre décolorants utilisés. De plus, la valeur du LT50 a démontré que les larves femelles sont mortes 23% plus rapidement que les mâles en présence du décolorant Blankophor HRS et 39% plus rapidement en présence du décolorant Tinopal LPW avec le virus. En tenant compte du LT95, les femelles sont mortes 33 et 54% plus rapidement que les mâles en présence des mêmes décolorants. Une augmentation du rapport mâles : femelles favorisant la survie des mâles peut jouer un rôle important dans la lutte biologique contre C. occidentalis au moyen du virus.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 1 , February 1999 , pp. 65 - 70
Copyright
Copyright © Entomological Society of Canada 1999

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