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INFLUENCE OF TEMPERATURE ON THE DEVELOPMENT OF A VIRUS DISEASE OF NEODIPRION SWAINEI (HYMENOPTERA: TENTHREDINIDAE)

Published online by Cambridge University Press:  31 May 2012

W. A. Smirnoff
W. A. Smirnoff
Affiliation:
Forest Research Laboratory, Department of Forestry and Rural Development, Quebec, Quebec
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Abstract

The effect of temperatures on the development of a virus disease of Neodiprion swainei Midd. was studied at constant temperatures of 30° and 12 °C., and under fluctuating temperatures (15°–20 °C.) in the laboratory and outdoors. Viral concentrations of 30 × 106 polyhedra per ml. and 1 × 106 polyhedra per ml. were used. Only the higher concentration of virus was effective at 30 °C. At 12 °C. the incubation period of the disease was prolonged and mortality caused by the virus was considerably reduced for both viral concentrations. Mortality due to the virus was similar at both viral concentrations for the fluctuating temperatures which were within the optimum temperature range for larval development.

Résumé

Etude des effets de quatre conditions de température sur le progrès d'une virose qui affecte Neodiprion swainei Midd. Les températures étaient soit constantes (30° et 12 °C.) ou fluctuantes (15° à 20 °C.). Le milieu : en laboratoire ou en plein air; la concentration de virus : 30 × 106 polyhèdres par ml. ou 1 × 106 polyhèdres par ml. A 30 °C., seule la première concentration s’avéra effective; à 12 °C., la période d'incubation fut plus longue et les virus, quel que soit le degré de concentration qu'on leur donnât, tuèrent beaucoup moins de tenthrèdes. Celles-ci moururent aussi sûrement devant l'une ou l'autre concentration de virus lorsque la température fluctuait mais approchait celle qui favorise le développement optimal des larves.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 3 , March 1967 , pp. 244 - 249
Copyright
Copyright © Entomological Society of Canada 1967

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References

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