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

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Authors

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

DOI:

https://doi.org/10.18311/jbc/1997/7569

Keywords:

Neem Bitter, Nuclear Polyhedrosis Virus, Spodoptera litura.

Abstract

Laboratory experiments showed that neem bitter (0.1%), an ethanol-soluble concentrate of neem oil cake when combined with nuclear polyhedrosis virus [5í—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 (1í—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.