Effect of elevated
temperature on the population dynamics of fall armyworm, Spodoptera frugiperda
K. Ashok1*,
V. Balasubramani2, J. S. Kennedy3, V. Geethalakshmi4,
P. Jeyakumar5 and N. Sathiah6
1,2,6Department of
Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore -
641003, India
3School of Post
Graduate Studies, Tamil Nadu Agricultural University, Coimbatore - 641003,
India
4Directorate of
Crop Management, Tamil Nadu Agricultural University, Coimbatore - 641003,
India
5Department of Crop
Physiology, Tamil Nadu Agricultural University, Coimbatore - 641003, India
*Corresponding Author Email : ashokg3s@gmail.com
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Abstract
Aim:
The present study was conducted to determine the growth, survival, fecundity
and mortality rate of Spodoptera frugiperda in maize at elevated
temperature.
Methodology: Biology and life table experiments were carried out
in custom made Open Top Chambers (4m x 4m x 4m size) fitted with SCADA under
increasing temperature regimes viz., 32˚C, 33˚C, 34˚C, 35˚C and 36˚C.
Each stage of the insects was examined daily and the fertility and life-table
parameters were calculated by using TWOSEX-MS chart.
Results:
The overall developmental time for egg, larva, pupa and adult stages (total
lifespan) at different elevated temperatures were in the order of 32˚C >
33˚C > 34˚C > 35˚C > 36˚C. The fecundity rate of S. frugiperda
at different elevated temperatures were in the order of 34˚C > 33˚C >
32˚C > 35˚C > 36˚C.
Interpretation: The current study confirms that the
elevated temperature regimes had a positive correlation with fecundity rate
upto 34˚C and negative correlation with the survival rate of S. frugiperda.
Key words: Life table, Population dynamics, S. frugiperda,
Temperature
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