African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Effect of Bt cotton on survival and development of tobacco caterpillar, Spodoptera litura (Fabricius) on different events of Bt hybrids

V. Chinna Babu Naik1*, N. V. V. S. D. Prasad2 and G. Ramachandra Rao1
1Department of Entomology, Agricultural College, Bapala-522101, Andhra Pradesh, India. 2Regional Agricultural Research Station, Lam, Guntur-522034, Andhra Pradesh, India.
Email: [email protected]

  •  Accepted: 30 October 2013
  •  Published: 14 November 2013

Abstract

Transgenic Bt Cotton hybrids expressing cry toxins with different events are available in India for cultivation offering resistance to bollworms. In the present investigation the impact of Bt Cotton hybrids derived from different events were studied in the laboratory on the growth and development of tobacco caterpillar, Spodoptera litura. The larval mortality when fed on leaves and squares of RCH 2 BG-II featuring Cry 1 AC + Cry 2 Ab was highest compared to other Bt Cotton hybrids with corresponding events. The susceptibility level of S. litura to RCH2 BG-II varied instar wise and the late instars had very little effect on the survival and developmental bioLogyof the insect. The development of S. litura was drastically affected as indicated by lowest growth and survival indices. The cry protein content was estimated from different plant parts of different events of transgenic Bt cotton hybrids at 60, 90, 120 and 150 DAS during the seasons.

Key words: Spodoptera litura, Bt cotton, survival, expansion, cry 1 AC + Cry 2 Ab.