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International Journal of Tropical Insect Science

, Volume 10, Issue 5, pp 573–576 | Cite as

Increased Insecticide Susceptibility in Heliothis Armigera (HBN.) and Spodoptera Litura F. Larvae Due to Bacillus Thuringiensis Berliner Treatment

  • C. Gailce Leo Justin
  • R. J. Rabindra
  • S. Jayaraj
Research Article

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. dans l’eau distillée à 300 mg/l. 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.

Key Words

Bacillus thuringiensis insecticide susceptibility Heliothis armigera Spodoptera litura endosulfan monocrotophos fenvalerate Cypermethrin 

Mots Cléfs

Sensibilité aux produits phytosanitaires induit Bacillus thuringiensis Heliothis armigera Spodoptera litura endosulfan monocrotophos fenvalerate cypermethrin 

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Copyright information

© ICIPE 1989

Authors and Affiliations

  • C. Gailce Leo Justin
    • 1
  • R. J. Rabindra
    • 1
  • S. Jayaraj
    • 1
  1. 1.Centre for Plant Protection StudiesTamil Nadu Agricultural UniversityCoimbatoreIndia

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