effects of neem(Azadirachta indica) seed kernel extracts from different solvents on the predacious mitePhytoseiulus persimilis and the phytophagous miteTetranychus cinnabarinus |
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| Authors: | F Mansour K R S Ascher N Omari |
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| Institution: | 1. Dept. of Entomology, ARO, Newe Ya’ar Regional Experiment Station, P.O., Haifa, Israel
2. Dept. of Toxicology, ARO, The Volcani Center, Bet Dagan, Israel
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| Abstract: | The effects of neem seed kernel extracts from different solvents on the predacious mitePhytoseiulus persimilis Athias-Henriot and the phytophagous miteTetranychus cinnabarinus (Boisd.) were compared. All extracts were much more toxic to the latter pest than to the former. Using the respective LC50 for the two species, the toxicity index (LC50 Phytoseiulus/LC50 Tetranychus) was found to be 3 for the methanol, 4 for the ethanol, 23 for the acetone, and 58 for the pentane extract. The order of toxicity of the extracts (pentane > acetone > ethanol > methanol) was valid only forT. cinnabarinus. The EC50s for reduction of fecundity were rather close for the two species. |
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