Combined Action of Nuclear Polyhedrosis Virus and Neem Bitter against Spodoptera litura (Fabricius) Larvae


  • Tamil Nadu Agricultural University, Centre for Plant Protection Studies, Coimbatore, Tamil Nadu, 641 003, India


Laboratory experiments showed that neem bitter (0.1%), an ethanol-soluble concentrate of neem oil cake when combined with nuclear polyhedrosis virus [5×105 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 LT50. The enhanced action was seen even at a lower dose of neem bitter (0.025%) with NPV (1×105 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.


Neem Bitter, Nuclear Polyhedrosis Virus, Spodoptera litura.

Subject Discipline

Agriculture Sciences

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