d-endotoxin Complex of Bacillus thuringiensis (Berliner) Strains on the Development of Helicoverpa armigera (Huebner)" /> Retarding Effect of Spore-d-endotoxin Complex of Bacillus thuringiensis (Berliner) Strains on the Development of Helicoverpa armigera (Huebner)
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Retarding Effect of Spore-d-endotoxin Complex of Bacillus thuringiensis (Berliner) Strains on the Development of Helicoverpa armigera (Huebner)



Feeroza Khalique and Khalique Ahmed
 
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ABSTRACT

The retardation in the development of Helicoverpa armigera by spore-d-endotoxin complex of different strains of Bacillus thuringiensis at 7 days exposure was evaluated through long term bioassays. Comparative studies in the development of test insect at 7 days exposure to the toxins of HD-I-S-1980 (16000 IU/mg) vs HD-244 (24,000 IU/mg) indicated non-significant differences in survivors at different developmental stages. However, both the toxins caused delayed effect on larval period. The changes in larval period were directly proportional to the log of concentration of the spore-crystal complex in the diet. The influence of toxin concentration had inverse correlation with the rate of pupation and adult emergence.

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  How to cite this article:

Feeroza Khalique and Khalique Ahmed , 2002. Retarding Effect of Spore-d-endotoxin Complex of Bacillus thuringiensis (Berliner) Strains on the Development of Helicoverpa armigera (Huebner). Pakistan Journal of Biological Sciences, 5: 853-857.

DOI: 10.3923/pjbs.2002.853.857

URL: https://scialert.net/abstract/?doi=pjbs.2002.853.857

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