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CHANGES IN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE), BIOMASS IN STANDS TREATED WITH COMMERCIAL BACILLUS THURINGIENSIS VAR. KURSTAKI

Published online by Cambridge University Press:  31 May 2012

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

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Larval biomass of the spruce bud worm, Choristoneura fumiferana (Clem.), in balsam fir, Abies balsamea L., stands was significantly reduced following aerial applications of commercial Bacillus thuringiensis (B.t.) (Thuricide 16B®, 24B and 32BX and Dipel 85®). Treatment with Dipel vehicle (Dipel 88® without B.t.) did not affect larval biomass. Biomass reduction following the Thuricide treatment was directly related to feeding activity. These findings support published observations on the long-term effect of B.t. on budworm populations.

Résumé

Des épandages aériens de préparations commerciales de Bacillus thurigiensis (B.t.) (Thuricide 16B®, 24B et 32BX et Dipel 85®) ont réussi à réduire nettement la biomasse des larves de la tordeuse des bourgeons de l'épinette (Choristoneura fumiferana) dans des peuplements de sapin baumier (Abies balsamea L.). Le traitement avec le véhicule seulement (Dipel 88® sans B.t.) a été sans effet sur la biomasse. La réduction de celle-ci à la suite du traitement au Thuricide est directement reliée à l'activité d'alimentation. Les résultats obtenus renforcent d'autres observations publiées concernant les effets à longue échéance de B.t. sur les populations de la tordeuse.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 4 , April 1983 , pp. 431 - 434
Copyright
Copyright © Entomological Society of Canada 1983

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