Effects of Some Insecticides Used in Gezira Scheme on Biomphalaria pfeifferi the Intermediate Host Snails of Human Schistosomiasis

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Date
2015-07-01
Authors
Sumaya El Tigany, Abd El Rahman
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UOFK
Abstract
The toxicity of the agricultural insecticides, used in Gezira Scheme, on Biomphalaria pfeifferi snails, the intermediate hosts of human intestinal schistosomiasis, was investigated under laboratory conditions and evaluated in the field during the spraying season of 1997. Field evaluation was done in two agricultural blocks (Dolga and Istarihna) in the northern part of the Scheme. The chemicals tested in the laboratory were the commercial forms of Metac, Birlane, Reldan, Danitol, Dursban, Endosulfan as well as the technical (pure) forms of the last three insecticides in addition to three ready prepared mixtures of pesticides. The concentrations used were 1.0, 0.5, 0.25, 0.1, 0.05 and 0.025 ppm respectively. Reldan and Metac proved to be the most toxic chemicals to Bio. pfeifferi snails, in terms of LC50 LC90 and LC95, while Birlane was the least toxic one. The LC50 LC90 and LC95for Reldan were 0.29, 0.72 and 0.93 ppm, respectively and for Metac were 0.33, 0.70 and 0.87 ppm respectively and for Birlane were 0.88, 1.29 and 1.1 ppm, respectively. The technical forms of the insecticides and the three ready-made mixtures had no lethal effect among the snails. The orgnophosphorus insecticides had an accumulative effect on the breeding of intestinal schistosomiasis intermediate host snails. Endosulfan, Danitol and Dursban were found to stop the hatching of the egg masses at higher concentrations, 1.0 and 0.5 ppm. The results indicated that some of the pesticides used in Gezira could have an impact on the snail populations in the Scheme. The significance of the results were discussed. The results also suggested that further research, in this field, is needed.
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Effects of Some Insecticides Used in Gezira Scheme on Biomphalaria pfeifferi the Intermediate Host Snails of Human Schistosomiasis
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