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Studies on granular formulations of Bacillus thuringiensis Berliner.

Ahmed, S. M. and Nagamma, M. V. and Majumder, S. K. (1973) Studies on granular formulations of Bacillus thuringiensis Berliner. Pesticide Science, 4 (1). pp. 19-23.

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Abstract

Survival of the spores of Bacillus thuringiensis in granular formulations was tested under storage conditions in the laboratory and also in outdoor conditions when exposed to the weather. The granular formulations were prepared with attapulgite and aqueous and non-aqueous carriers. The virulence of the spore formulation was tested on larvae of Bombyx mori (L.). A 0.4% spore concentration, with an initial count of 64 X 106, gave ultimately 0.3-0.4 X 106 viable spores/g of the granules after 248 days of storage in the room. The viable count of spores in the granules exposed to outdoor conditions fell rapidly within two days; at the end of 65 days, it was maintained at between 3 X 104 and 12 X 104/g of the granules. The optimum concentration required in granules for 100% mortality of the test insect was found to be 0.4 X 106 spores/g, at the rate of 50 mg granules/85 cm2 of leaf surface. The granular formulation of Bacillus thuringiensis was found to be more virulent than a Thuricide dust formulation.

Item Type: Article
Uncontrolled Keywords: formulations-; entomopathogens-; pathogens-; agricultural-entomology
Subjects: 600 Technology > 03 Agriculture > 05 Insect/Pest Control
Divisions: Food Protectants and Infestation Control
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 20 Dec 2016 07:49
Last Modified: 20 Dec 2016 07:49
URI: http://ir.cftri.com/id/eprint/8416

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