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STUDIES ON SURVIVAL, DEVELOPMENT AND LARVAL MIGRATION OF Spodoptera litura (Fab.) ON BOLLGARD-II COTTON

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Title STUDIES ON SURVIVAL, DEVELOPMENT AND LARVAL MIGRATION OF Spodoptera litura (Fab.) ON BOLLGARD-II COTTON
 
Creator RAMANJALI, T
 
Contributor SINGH, T. V. K
 
Subject animal developmental stages, cotton, hybrids, biological phenomena, planting, proteins, developmental stages, transgenics, toxins, land resources
SURVIVAL, DEVELOPMENT, LARVAL, MIGRATION, Spodoptera litura, BOLLGARD-II, COTTON
 
Description Field and laboratory experiments were conducted to study the survival,
development and migration of tobacco caterpillar, Spodoptera litura (Fab.) at College farm
and Bt lab, Department of Entomology, College of Agriculture, Rajendranagar, Hyderabad
during Kharif, 2013-2014.
Eleven Bollgard-II and non-Bt cotton plant parts of 60, 75, 90 and 125 DAS were
fed to the first, second, third and fourth instar larvae of S. litura which were reared from
stock culture on castor leaves. All the indices of survival and developmental parameters
i.e., larval mortality, weight, length and width were recorded at seven days after releasing
of the larvae on leaves, squares and bolls of eleven Bollgard-II cotton and non-Bt cotton.
The results obtained from the lab studies revealed that the mortality, weight, length
and width of first, second, third instar larvae of S. litura fed on Bollgard-II cotton plant
parts were significantly different from those larvae fed on non-Bt cotton. In case of first,
second and third instar mortality increased and larval length decreased on eleven BG-II
cotton hybrids. There was no statistical difference observed in the mortality, weight, length
and width of fourth instar larvae reared on Bollgard-II cotton and non-Bt cotton.
Cry protein (Cry 1 Ac and Cry 2 Ab) content was also estimated from the leaves,
squares and bolls of eleven Bollgard-II cotton hybrids at 60, 75 and 90 DAS of the crop.
The Cry 2 Ab expression was highest in leaves, squares and bolls of eleven BG-II hybrids,
compared to Cry 1 Ac expression. The Cry protein expression varied with the plant parts
viz., leaves showing highest amount of Cry protein followed by squares and bolls. The
expression of Cry 1 Ac and Cry 2 Ab was highest at 75 DAS than that of 60 and 90 DAS in
leaves.
Author : T. RAMANJALI
Title of the thesis : STUDIES ON SURVIVAL, DEVELOPMENT AND
LARVAL MIGRATION OF Spodoptera litura (Fab.) ON
BOLLGARD-II COTTON
Degree : M A S T E R O F SCIENCE IN AGRICULTURE
Faculty : AGRICULTURE
Major Field : E N T OMOLOGY
Chairperson : P r o f . T . V. K. SINGH
University : A C H A RYA N. G. RANGA AGRICULTURAL
UNIVERSITY
Year of Submission : 2014
The development of the S. litura larvae was reduced and the per cent mortality
increased at 75 DAS than 60, 90 and 125 DAS i.e. with the increase in Cry protein
expression at 75 DAS, the growth of larvae reduced and per cent mortality increased.
Migration of S. litura larvae from non-Bt to BG-II cotton hybrid and within BG-II
cotton field was observed at 60, 75 and 90 DAS. The larval migration was more in BG-II
cotton field compared with refugia. More number of larvae were observed on leaves
followed by flowers, squares and bolls irrespective of BG-II cotton and non-Bt cotton.
The larval mortality of S. litura has been increased and weight, length and width of
S. litura has been decreased on BG-II cotton compared to non-Bt, because of Cry protein
content and expression was more in BG-II cotton. Migration of larvae was also more in
BG-II cotton compared to non-Bt and less number of larvae were observed in BG-II cotton.
The present study indicates that the Cry 2 Ab protein in BG-II cotton hybrids
reduces the S. litura damage and population than non-Bt.
 
Date 2016-09-12T12:04:37Z
2016-09-12T12:04:37Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76425
 
Language en
 
Relation D9685;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD