EFFECT OF CRY TOXINS ON LENGTH AND WIDTH OF TOBACCO CATERPILLAR, Spodoptera litura (FAB.)

T. RAMANJALI¹*, T.V.K. SINGH², C. NARENDRA REDDY^3
1Department of Entomology, College of agriculture, Rajendranagar, Hyderabad,Telangana, 500030, India
²Jayashankar Telangana State Agricultural University, Rajendranagar, Hyderabad, Telangana, 500030, India
³Department of Entomology, College of agriculture, Rajendranagar, Hyderabad,Telangana, 500030, India
* Corresponding Author : anjalithirri@gmail.com

Received : 22-08-2017     Accepted : 28-08-2017     Published : 30-08-2017
Volume : 9     Issue : 40       Pages : 4632 - 4637
Int J Agr Sci 9.40 (2017):4632-4637

Keywords : Bollgard-II, Cry toxins, length and width, S. litura
Academic Editor : Rai Chandan Kumar
Conflict of Interest : None declared
Acknowledgements/Funding : The authors are thankful to Monsanto company, Bengaluru, India for providing the seeds.
Author Contribution : All author equally contributed

Laboratory experiment was conducted during Kharif-2013 to evaluate the effect of the Cry toxins (Cry1Ac+Cry2Ab) against Tobacco caterpillar, Spodoptera litura (Fab.). For this eleven Bollgard-II cotton hybrids and one non Bt cotton were grown in the field. The leaves, squares and bolls which were collected (Periodically at 60, 75, 90 and 125 DAS) from the field were taken to the lab. On those plant parts different instars (first, second, third and fourth instar) of S. litura were reared in the laboratory conditions to know the effect of Cry toxin on the length and width of the S. litura larvae. The length and width of the larvae were decreased in BG-II reared larvae then non BT. Hence, the cry toxins showed a significant effect on the length and width of the S. litura larvae. Within the instars also the effect of Cry toxins were more on the first, second and third instar larvae when compared to the fourth instar larvae.

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