Abstract
Among the hexane and ethyl acetate neem extracts, highest antifeedancy of 89.33% was recorded in ethyl acetate at 10% concentration. The results of the laboratory evaluation of the Nerium oleander crude solvent extracts with regard to the poison food technique showed that with increasing concentration the feeding deterrence action increased against third instar larvae of Spodoptera litura and at the maximum concentration tested was recorded as 81.22 and 78.35 per cent at ethyl acetate and diethyl ether nerium crude extract, respectively. Both neem and Nerium showed higher antifeedant activity against S. litura with 10% concentration of ethyl acetate.
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