Biology and management of leaf eating caterpillar, S. litura on castor

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Castor (Ricinus communis L.) belongs to family Euphorbiaceae is one of the most important and valuable non-edible in oilseed group. It can be grown under varying soil types and erratic nature of monsoon due to its drought tolerance habit. Of the nine biocides evaluated against S. litura infesting castor, Spodoptera litura Nuclear Polyhedrosis Virus @ 250 LE/ha, Beauveria bassiana (0.4%) were effectively manage the incidence of S. litura on castor. These two biocides produced higher (26.77 to 28.33 q /ha) yield of castor. In the above treatments, yield increase over control ranged from 81.30 to 91.88 per cent, whereas avoidable losses were up to 7.18 per cent. The NICBR was noted 1:35.38 and 1:24.01 in effective biocides of Spodoptera litura Nuclear Polyhedrosis Virus @ 250 LE/ ha and Beauveria bassiana @ 0.4 %, respectively. Among the nine synthetic insecticides tested against S. litura on castor, chlorantraniliprole 20 SC @ 0.006% and emamectin benzoate 5 WG @ 0.002% performed better to protect the castor crop. These two insecticides produced higher (31.10 to 31.83 q /ha) yield of castor. In the above treatments, yield increase over control ranged from 21.24 to 90.48 per cent.