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The tobacco caterpillar, Spodoptera litura Fabricius has emerged as a serious and dominant pest on many agricultural crops causing enormous losses. The use of plant extracts to manage S. litura as an eco friendly management strategy in organic farming is the need of the day. A cold ethyl alcohol extract of seeds of Annona squamosa at different concentrations from 0.5 per cent to 25 per cent was administered to lab-reared; pre starved fourth instar larvae, topically as well as through food. The fourth instar larvae treated topically with the 25 per cent extract exhibited a total larval mortality of 61.66±1.66 per cent and the total per cent mortality was 80.0±0 during its development to the adult stage. The larvae which were administered the plant extract through their food showed total mortality of 76.66±4.41% at 25 per cent concentration, of which 61.66±1.66 per cent was at the larval stage itself. Larval-pupal and pupal-adult deformed stages were observed during the development but the adults were normal. Mortality was observed in the larvae and pupae. LC50 and LC90 values for topical application was 21.52 and 47.87 respectively .The same for leaf application was 25.75 and 53.70. The seed extract also exhibited phagodeterrent properties.
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