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EFFECT OF BACILLUS THURINGIENSIS ON FEEDING AND ENERGY USE BY PLODIA INTERPUNCTELLA (LEPIDOPTERA: PYRALIDAE) AND TRIBOLIUM CASTANEUM (COLEOPTERA: TENEBRIONIDAE)1

Published online by Cambridge University Press:  31 May 2012

A.S. Abdel-Razek ,
H.S. Salama ,
N.D.G. White  and
O.N. Morris
A.S. Abdel-Razek
Affiliation:
National Research Centre, Department of Pest and Plant Protection, Dokki, Cairo, Egypt
H.S. Salama
Affiliation:
National Research Centre, Department of Pest and Plant Protection, Dokki, Cairo, Egypt
N.D.G. White*
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
O.N. Morris
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
*
2Author to whom all correspondence should be addressed.
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Abstract

Investigations were conducted to quantify the effects of treatment of cracked wheat, Triticum aestivum L. (Gramineae), kernels with sublethal and median-lethal concentrations of Bacillus thuringiensis Berliner 1915 (Eubacteriales: Bacillaceae) on the energy use by Plodia interpunctella (Hübner) 1813 and Tribolium castaneum (Herbst) 1797 larvae. Cumulative food consumption and egestion during insect development and the weight and energy values of adult insects were determined and oxygen consumption was estimated. At sublethal (4 μg/g wheat for P. interpunctella, 250 μg/g wheat for T. castaneum) and median-lethal (18 μg/g wheat for P. interpunctella, 1950 μg/g wheat for T. castaneum) concentrations, food consumption during development decreased from controls by 9.1% and 47.1%, respectively, for P. interpunctella and 14.4% and 38.2%, respectively, for T. castaneum. Egestion decreased by 9.5% and 61.5% for P. interpunctella and 19.4% and 47.3% for T. castaneum at these respective concentrations. Increasing B. thuringiensis had negative effects on food consumption and energy use by the insects. Levels of B. thuringiensis lower than required for complete control may assist in protecting grain from stored-product insects.

Résumé

Nous avons cherché à quantifier les effets de traitements de grains de blé concassé au moyen de concentrations sub-létales et moyennement létales de Bacillus thuringiensis Berliner 1915 (Eubacteriales : Bacillaceae) sur la dépense énergétique des larves de Plodia interpunctella (Hübner) 1813 (Lepidoptera : Pyralidae) et Tribolium castaneum (Herbst) 1797 (Coleoptera : Tenebrionidae). Les valeurs cumulatives de la consommation de nourriture et de l’égestion au cours du développement, de même que la masse des insectes adultes et leurs valeurs énergétiques, ont été déterminées; de plus, la consommation d’oxygène a été estimée. À des concentrations sub-létales (4 μg/g de blé dans le cas de P. interpunctella, 250 μg/g de blé dans le cas de T. castaneum) et moyennement létales (18 μg/g de blé dans le cas de P. interpunctella et 1950 μg/g de blé dans le cas de T. castaneum), la consommation de nourriture au cours du développement était de 9,1% ou de 47,1% plus faible que chez les insectes témoins selon la concentration dans le cas de P. interpunctella, et de 14,4% ou de 38,2% plus faible que chez les témoins dans le cas de T. castaneum. Toujours selon la concentration, l’égestion était de 9,5% ou de 61,5% plus faible que chez les témoins dans le cas du papillon et de 19,4% ou de 47,3% plus faible que chez les témoins dans le cas du ténébrion. L’augmentation des concentrations de B. thuringiensis a eu des effets négatifs sur la consommation de nourriture et la dépense énergétique des insectes. Les concentrations de B. thuringiensis plus faibles que les concentrations totalement létales peuvent protéger le grain contre les insectes ravageurs des denrées entreposées.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 4 , August 1999 , pp. 433 - 440
Copyright
Copyright © Entomological Society of Canada 1999

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Footnotes

1

Contribution No. 1740 of the Cereal Research Centre, Agriculture and Agri-Food Canada, Winnipeg.

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