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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

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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