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CONTACT AND FEEDING TOXICITIES OF ACEPHATE AND CARBARYL TO LARVAL STAGES OF THE WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

Jacqueline L. Robertson
Jacqueline L. Robertson
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Berkeley, California 94701
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Abstract

Spray and feeding bioassays of acephate and carbaryl were conducted with each of the six instars of the western spruce budworm, Choristoneura occidentalis Freeman. Dose-mortality regressions were used to estimate overall relative susceptibility. Small differences in overall susceptibility of the six instars to acephate and large differences to carbaryl were observed. Application of carbaryl so that it would be present when second instars emerge from their hibernacula may maximize efficacy by minimizing the tolerance-instar effect. The efficacy of acephate may be relatively unaffected by instar-related changes in tolerance.

Résumé

L’acéphate et le carbaryle ont été testés par vaporisation et par alimentation sur chacun des 6 stades de la tordeuse occidentale de l’épinette, Choristoneura occidentalis Freeman. Des régressions dose-mortalité ont permis d’évaluer la susceptibilité globale relative. Des différences de susceptibilité globale, mineures pour l’acéphate, et importantes pour le carbaryle, ont été observées entre les stades. Une application de carbaryle qui assurerait sa présence lors de la sortie des larves de deuxième stade de leur hibernaculum, devrait maximiser son efficacité en minimisant l’effet tolérance/stade. L’efficacité de l’acéphate devrait être relativement peu affectée par les changements de tolérance liés au stade.

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 10 , 01 October 1980 , pp. 1001 - 1006
Copyright
Copyright © Entomological Society of Canada 1980

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