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EFFECTS OF SELECTED JUVENILE HORMONE ANALOGS ON SIXTH-INSTAR LARVAE OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA CLEMENS (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

Hemendra Mulye  and
Roger Gordon
Hemendra Mulye
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9
Roger Gordon
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9
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Abstract

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The effectiveness of seven insect juvenile hormone analogs (JHAs) in disrupting metamorphosis of the eastern spruce budworm, Choristoneura fumiferana Clemens, was determined by applying the compounds topically to early sixth-instar larvae and monitoring subsequent development. Fenoxycarb showed promising control potential, with an LC50 of 0.26 μg per insect. Relative lethal effectiveness, based on LC50 values, was Fenoxycarb > ZR9892 > ZR8487 > S-71639 > methoprene > ZR9582 > ZR10151. Some of the JHAs tested may be useful in an integrated spruce budworm control program.

Résumé

L’efficacité de sept analogues de l’hormone juvénile (JHA) à perturber la métamorphose de la tordeuse des bourgeons de l’épinette, Choristoneura fumiferana Clemens, a été mesurée par application locale de ces substances à de jeunes larves du stade six, suivie de l’observation du développement. Le Fenoxycarb, avec une CL50 de 0,26 μg par insecte, a montré un pouvoir léthal intéressant. L’efficacité léthale relative basée sur la valeur de la CL50 sétablit comme suit : Fenoxycarb > ZR9892 > ZR8487 > S-71639 > methoprene > ZR9582 > ZR10151. Certains des JHA testés pourraient être utilisés dans un programme de lutte intégrée contre la tordeuse.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 12 , December 1989 , pp. 1111 - 1116
Copyright
Copyright © Entomological Society of Canada 1989

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