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COMPARATIVE EFFICACY OF THURICIDE 16B® AND DIPEL 88® AGAINST THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE) IN BALSAM FIR STANDS

Published online by Cambridge University Press:  31 May 2012

O. N. Morris
O. N. Morris
Affiliation:
Forest Pest Management Institute, Canadian Forestry Service, Sault Ste. Marie, Ontario P6A 5M7
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Abstract

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The effectiveness of Thuricide 16B®, a water-based commercial formulation of Bacillus thuringiensis var. torstaki (B.t.), Dipel 88®, an oil-based formulation, and the Dipel® vehicle (Dipel 88 without B.t.) were compared by aerial applications against the spruce budworm, Choristoneura fumiferana (Clem.) in balsam fir, Abies balsamea (L.) stands. The two B.t. products applied at similar dosage rates were similar in effectiveness and the Dipel vehicle was not toxic for budworm larvae at rates applied Comparisons of populations of parasites made between pre- and post-spray sampling periods and between treated and untreated plots indicated no direct effect of Dipel 88 on the rate of larval and pupal parasitism.

Résumé

L'efficacité du Thuricide 16B®, préparation commerciale aqueuse de Bacillus thuringiensis var. kurstaki (B.t.). du Dipel 88®, préparation huileuse, et du véhicule Dipel® (Dipel 88 sans B.t.), en épandages aériens, contre les attaques de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clem.), dans les peuplements de sapin banmier, Abies balsamea (L.), a été comparée. Aux mêmes doses, les deux produits renfermant B.t. se sont montrés tout aussi efficaces, et aux doses employées le Dipel n était pas toxique pour la tordeuse. Les comparaisons effectuées entre les populations de parasites avant et après les arrosages et entre les parcelles traitées et non traitées n ont révélé aucun effet direct du Dipel 88 sur le taux de parasitisme des larves et des chrysalides.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 8 , August 1983 , pp. 1001 - 1006
Copyright
Copyright © Entomological Society of Canada 1983

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