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Toxicity Experiments of the Saponic Extract of <I>Cestrum Parqui</I> (<I>Solanaceae</I>) on Some Insect Spices

Author(s): Chaieb Ikbal | Ben Halima Mounia | Ben Hamouda Habib

Journal: Journal of Entomology
ISSN 1812-5670

Volume: 4;
Issue: 2;
Start page: 113;
Date: 2007;
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Keywords: toxicity tests | crude saponic extract | Cestrum parqui | insects

Schistocerca gregaria) and the cotton noctuid (Spodoptera littoralis), a stored products devastating insect (Tribolium confusum) and a health harmful hematophagous insect (Culex pipiens). Several biological toxicity assays were elaborate according to the species and the stage used. Experiments utilizing injection, grafting, forced ingestions, experiments of contact toxicity or toxicity by incorporation to the food substrate were employed. All these experiments enabled us to conclude that the application by contact of the CSE is generally ineffective because of the impossibility of passage of saponins (hydrophilic molecules) through the cuticle of the insect. The saponic extract must be introduced by the insect to express a toxicity from where the idea to design toxic soft foods based on extract saponic of Cestrum.]]>
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