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Evaluation of Relative Fluoride Toxicity and Its Impact on Growth, Economic Characters and Fecundity of the Silkworm, Bombyx mori L.

B. Surendra Nath|S. Ramakrishna|Jayaprakash
한국잠사학회 (Korean Society Of Sericultural Science)|2004.06|International Journal of Industrial Entomology and Biomaterials|제8권 제2호|pp. 151-159

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Abstract

A detailed evaluation of relative toxicity of fluoride to the 5th instar larvae of PM and NB4D2 races of silkworm and the effects of lethal, sublethal and prevailing levels of fluoride in groundwater on the growth, economic characters and fecundity of the silkworm, Bombyx mori (Lepidoptera: Bombycidae) were studied. The feeding of mulberry, Morus alba leaves treated with lethal and sublethal doses of fluoride to PM and NB4D2 races of silkworms from the beginning of the 5th instar to the end of the feeding period resulted in significant reduction in growth, single cocoon weight, single shell weight, silk index, average filament length, and fecundity when compared to controls. These changes were more pronounced on exposure to lethal dose than sublethal dose and in general, the changes induced by fluoride were more striking in NB4D2 than PM, indicating the greater resistance of PM to higher fluoride levels. Groundwater quality in sericulturally important villages of Karnataka and Andhra Pradesh States has been studied with special reference to the presence of fluoride. On exposure to dose of prevailing levels in the waters of sericulturally important areas, the changes observed on growth, economic characters and fecundity were slightly lower when compared to controls and the decrease was found to be insignificant (P ³ 0.05). It was concluded that, though minute dose (4.0 ppm) of fluoride did not have any toxic impact, it is toxic at higher concentrations to silkworms.

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관련 논문AI추천

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