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FIELD TESTS ON CONTROL OF THE IMPORTED CABBAGEWORM (LEPIDOPTERA: PIERIDAE) AND THE CABBAGE LOOPER (LEPIDOPTERA: NOCTUIDAE) BY MIXTURES OF MICROBIAL AND CHEMICAL INSECTICIDES

Published online by Cambridge University Press:  31 May 2012

Robert P. Jaques
Affiliation:
Agriculture Canada Research Station, Harrow, Ontario, Canada N0R 1G0

Abstract

The efficacy of mixtures of permethrin and Bacillus thuringiensis var. kurstaki Berliner (B.t.), Autographa californica (Speyer) nuclear polyhedrosis virus (ACNPV), or Pieris (= Artogeia) rapae (L.) granulosis virus (PRGV) against the cabbage looper, Trichoplusia ni (Hübner), and the imported cabbageworm, P. rapae, was assessed by field plot tests. Protection of the crop and yield by plots treated with several of the reduced-dosage mixtures were similar to protection and yield by plots treated with permethrin at the full rate, demonstrating a feasible procedure for reducing the amount of chemical insecticide applied without sacrificing protection of the crop. Furthermore, efficacy of the biological component of the mixtures, B.t. or viruses, was frequently enhanced by low concentrations of the chemical component on the mixture.

Résumé

L’efficacité de mélanges de perméthrine et de Bacillus thuringiensis var. kurstaki Berliner (B.t.), du virus de la polyhédrose nucléaire Autographa californica (Speyer) (ACNPV), ou du virus de la granulose Pieris (= Artogeia) rapae (L.) (PRGV) contre la fausse-arpenteuse du chou, Trichoplusia ni (Hübner), et la piéride du chou, P. rapae, a été évaluée par des essais parcellaires en plein champ. La protection de la culture et les rendements des parcelles traitées de plusieurs mélanges à dose réduite ont été semblables à ceux des parcelles traitées à la perméthrine à pleine dose, ce qui démontre la possibilité de réduire la quantité d’insecticide chimique appliqué sans sacrifier la production de la culture. En outre, l’efficacité de la composante biologique du mélange, soit B.t. ou les virus, est fréquemment relevée par de faibles concentrations de la composante chimique du mélange.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1988

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