Abstract
AbstractThe toxicity of the insect toxin from the venom of the scorpion Androctonus australis Hector (AaH IT) was assayed using several ethods of application on various insect species. Activity was only demonstrated by opical application on Musca domestica. Three different solvents were assayed: ethanol + water (50 + 50 by volume), acetone + water (80 + 20 by volume) and acetone + dimethyl sulphoxide (50 + 50 by volume). When using the last two mixtures, LD50 was found to be 1 μg 100 mg−1 fly. When this activity is compared to that of five synthetic insecticides tested in the same conditions, AaH IT is about 1‐5 times more active than propoxur and DDT, 10 times more active than malathion but 200 times less active than deltamethrin. No activity was observed against Aphis craccivora at 15 mg m−2 in surface‐contact tests on glass, or against Culex pipiens pipiens larvae at 2 × 105 ng litre−1 in water.
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