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JOINT ACTION OF A JUVENILE HORMONE ANALOGUE WITH BENZOYLPHENYLUREAS1 INGESTED BY WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE)2

Published online by Cambridge University Press:  31 May 2012

Jacqueline L. Robertson
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service U.S. Department of Agriculture, Berkeley, California, U.S.A.94701
Kimberly C. Smith
Affiliation:
Pacific Southwest Forest and Range Experiment Station, Forest Service U.S. Department of Agriculture, Berkeley, California, U.S.A.94701
Jeffrey Granett
Affiliation:
Department of Entomology, University of California, Davis, California, U.S.A.95616
Arthur Retnakaran
Affiliation:
Forest Pest Management Institute, Canadian Forestry Service Sault Ste. Marie, Ontario, Canada P6A 5M7

Abstract

Mixtures of the juvenile hormone analogue (JHA) methoprene and each of three benzoylphenylureas (BPUs) were fed to sixth-instar western spruce budworm, Choristoneura occidentalis Freeman. The BPUs tested were diflubenzuron, BAY SIR 8514 (N-[(trifluoromethoxy)phenyl]carbamoyl-2-chlorobenzamide), and EL-127063 (N-[[[5-(4-bromphenyl)-6-metnyl-2-pyrazinyl]amino]carbonyl]-2-chlorobenzamide). Mixtures consisted of JHA:BPU combined in 1:9 proportions. Ingestion of methoprene combined with BAY SIR 8514 or diflubenzuron resulted in significantly lower mortality than expected under a simple model of uncorrelated, independent action. Ingestion of the mixture of methoprene and EL-127063, however, resulted in significantly enhanced toxicity over the upper response range (> 50% mortality).

Résumé

Des mélanges de l'analogue de l'hormone juvénile (AHJ) méthoprene avec l'un ou l'autre de trois composés de type benzoylphénylurée (BPU) ont été donnés en nourriture à des larves de sixième stade de la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman. Les trois composés de type BPU testés étaient le diflubenzuron, BAY SIR 8514 (N-[(trifluoromethoxy)phenyl]carbomoyl)-2-chlorobenzamide), et EL-127063 (N-[[[5-(4-bromphenyl)-6-methyl-2-pyrazinyl]amino]carbonyl]-2-chlorobenzamide). Les mélanges étaient faits de AHJ : BPU aux proportions de 1 : 9. L'ingestion de méthoprene en combinaison avec le BAY SIR ou le diflubenzuron a causé significativement moins de mortalité que prévu selon un modèle d'action simple indépendante et non corrélée. Par ailleurs, l'ingestion du mélange méthoprene avec EL-127063 a causé une toxicité significativement augmentée par rapport à la partie supérieure de la courbe de réponse (> 50% de mortalité).

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1984

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