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RELATIVE POTENCIES OF 50 ISOLATES OF BACILLUS THURINGIENSIS FOR LARVAE OF THE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

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

Fifty Bacillus thuringiensis (B.t.) isolates representing K-1, galleriae, K-73, thuringiensis, aizawai, dendrolimus, tolworthi, kenyae, darmstadiensis, alesti, and entomocidus crystal antigen types were bioassayed against fifth-instar spruce budworm, Choristoneura fumiferana (Clem.), larvae. In addition, larvae reared on diet with and without aureomycin were tested for their susceptibility to B.t. The data indicated no significant differences in susceptibility to B.t. among insects reared on aureomycin or on aureomycin-free diet, but differences were evident in larval growth and mortality among untreated controls. None of the 50 isolates bioassayed was any more toxic to the budworm than is the strain used at present in commercial preparations of B. thuringiensis.

Résumé

Cinquante isolats de Bacillus thuringiensis (B.t.) représentant les types antigéniques à l'état cristallisé K-1, galleriae, K-73, thuringiensis, aizawai, dendrolimus, tolworthi, kenyae, darmstadiensis, alesti et entomocidus ont été testés contre des larves au cinquième stade de la tordeuse des bourgeons de l'épinette, Choristoneura fumiferana (Clem.). De plus, la vulnérabilité envers B.t. des larves élevées avec une alimentation additionnée ou exempte d'auréomycine a été examinée. Les résultats n'indiquent aucune différence quant à la vulnérabilité des larves alimentées avec ou sans auréomycine, mais des différences sont apparues au niveau de la croissance et de la mortalité chez les larves témoins non traitées. Aucun des 50 isolats testés n'était plus toxique pour la tordeuse que la variété présentement employée dans des préparations commerciales.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 7 , July 1983 , pp. 815 - 822
Copyright
Copyright © Entomological Society of Canada 1983

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