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Increased insecticide susceptibility in Heliothis armigera (Hbn.) and Spodoptera litura F. Larvae due to Bacillus thuringiensis Berliner Treatment
Published online by Cambridge University Press: 19 September 2011
Abstract
Laboratory bioassay tests showed that Bacillus thuringiensis (B.t.) (Bactospeine) treatment of second instar larvae of Heliothis armigera (Hbn.) and Spodoptera litura F. increased their susceptibility to endosulfan, monocrotophos, fenvalerate and cypermethrin. The LC50 of these insecticides to both the species of larvae were lowered when treated with B.t. Comparison of susceptibility ratios showed that the increased susceptibility to insecticides was more in H. armigera than in S. litura larvae.
Résumé
Les épreuves de bioassay au laboratoire ont montré que la sensibilité aux endosulfan, fenvalerate, monocrotophos et cypermethrine est augmenté aux larves d'Heliothis armigera et Spodoptera litura lorsque leurs larves du deuxième stade sont inoculé par le Bacillus thuringiensis (B.t.) (Bactospeine). On les a inoculé en les permettant à nourrir pour 24 h sur les feuilles de Poischiche (Cicer arietinum) et de ricin (Ricinus communis) traités par une suspension du B.t. à dans l'eau distillée à 300 mg/1. Les valeurs de LC50 de ces produits phytosanitaires aux tous les deux espéces des larves ont abaissés lorsqu' elles sont étaient inoculées avec le B.t. La comparaison des rapports de la sensibilité a montré que la sensibilité induit par le B.t. aux produits phytosanitaires a été davantage aux larves d'Heliothis armigera que de S. litura.
Keywords
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- Information
- International Journal of Tropical Insect Science , Volume 10 , Issue 5 , October 1989 , pp. 573 - 576
- Copyright
- Copyright © ICIPE 1989
References
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