Laboratory experiments showed that neem bitter (0.1 ), an ethanol-soluble concentrate of neem oil cake when combined with nuclear polyhedrosis virus 5Xl0~5 polyhedral occlusion bodies (POBs/ml) along with crude sugar (1 ) caused a significantly higher mortality of Spodoptera litura (Fabricius) larvae. The NPV-neem bitter-crude sugar combination recorded the shortest LT_(50). The enhanced action was seen even at a lower dose of neem bitter (0.025) with NPV (IxlO5 POBs/ml) and crude sugar (1). Without crude sugar, the NPV-neem bitter combination was not effective in increasing the mortality. The larval weight and growth rate were significantly reduced in NPV-neem combination.
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