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Bio-efficacy of bacterial insecticide,Bacillus thuringiensis Berl. as biological control agent against snails vectors of Schistosomiasis in Egypt

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Abstract

The molluscicidal activity of Thuricide used as bacterial insecticide,Bacillus thuringiensis, againstBiomphalaria alexandrina andBulunus truncatus was tested.

The obtained results indicate that Thuricide possess a mollus-cicidal activity against both snails species.B. truncatus was more sensitive to the action of Thuricide. However the slope function of the LC50 forB. alexandrina was significantly higher than that forB. truncatus. The mortality rate of exposedB. alexandrina increased by increasing the exposure time.

Exposure ofB. alexandrina to low concentration of Thuricide caused a significant decrease in both ovipository activity and size of egg masses and reduced the percentage of egg hatchability.

Zusammenfassung

Es wurde die molluscizide Wirkung von Thuricide (Bac. thuringiensis) gegen die SchneckenBiomphalaris alexandrina undBulunus truncatus getestet. Die Ergebnisse zeigen, daß Thuricide für beide Schnecken molluscizid war.B. truncatus erwies sich als empfindlicher, doch war die Neigungs-Funktion des LC50-Wertes fürB. alexandrina signifikant höher als fürB. truncatus. Die Mortalitätsrate vonB. alexandrina erhöhte sich mit zunehmender Expositionszeit. Die Exposition vonB. alexandrina gegenüber geringen Konzentrationen von Thuricide verursachte eine signifikante Verringerung sowohl der Eiablage-Aktivität als auch der Größe der Eigelege sowie des Schlüpfprozents der Eier.

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  1. Department of Zoology, Faculty of Science, Menoufia University, Shebin El-Kom, Egypt

    G. Y. Osman & A. M. Mohamed

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  1. G. Y. Osman
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  2. A. M. Mohamed
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Osman, G.Y., Mohamed, A.M. Bio-efficacy of bacterial insecticide,Bacillus thuringiensis Berl. as biological control agent against snails vectors of Schistosomiasis in Egypt. Anz. Schadlingskde., Pflanzenschutz, Umweltschutz 64, 136–139 (1991). https://doi.org/10.1007/BF01906005

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