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The toxicity of phosphine, methyl bromide, 1,1,1-trichloroethane and carbon dioxide alone and as mixtures to the pupae of red flour beetle, Tribolium castaneum Herbst.

Rajendran, S. (1990) The toxicity of phosphine, methyl bromide, 1,1,1-trichloroethane and carbon dioxide alone and as mixtures to the pupae of red flour beetle, Tribolium castaneum Herbst. Pesticide Science, 29 (1). pp. 75-83.

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Abstract

The toxicity of phosphine, methyl bromide, 1,1,1-trichloroethane (methylchloroform) and carbon dioxide, and mixtures of phosphine + methyl bromide, methyl bromide + methylchloroform, phosphine + carbon dioxide, and methyl bromide + carbon dioxide to 1- to 2-day-old pupae of the tenebrionid flour pest Tribolium castaneum was investigated. Joint action ratios estimated at LD50 and LD90 for a 24-h exposure indicated no enhancement of toxicity for mixtures of phosphine and methyl bromide, or methylchloroform and methyl bromide on the pupae. Carbon dioxide up to 40% in air enhanced the toxic action of phosphine as well as of methyl bromide. Higher levels of carbon dioxide, however, failed to improve the toxicity of phosphine or methyl bromide proportionately. Carbon dioxide used alone produced a maximum of 11% mortality of the pupae exposed to 10-70% levels for 24 h. The order of toxicity of the fumigants both at LD50 and LD90 was phosphine > methyl bromide > methylchloroform.

Item Type: Article
Uncontrolled Keywords: Insect-pests; Stored-products-pests; Insecticides-; Synergism-; fumigants-; toxicity-; Phosphine-; Methyl-bromide; Carbon-dioxide; mixtures-; control-; stored-products; biodeterioration-; pesticide-synergists; agricultural-entomology
Subjects: 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 26 Pesticide Chemistry
600 Technology > 01 Medical sciences > 17 Toxicology
Divisions: Food Protectants and Infestation Control
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 27 Aug 2018 08:35
Last Modified: 27 Aug 2018 08:35
URI: http://ir.cftri.com/id/eprint/8197

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