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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Jul 2021, 42 (4)                                     Back


nstantaneous and historical temperature effects on a-pinene

Effect of elevated temperature on the population dynamics of fall armyworm, Spodoptera frugiperda

 

K. Ashok1*, V. Balasubramani2, J. S. Kennedy3, V. Geethalakshmi4, P. Jeyakumarand 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

 

 

Received: 24.12.2020                                                                Revised: 24.02.2021                                                    Accepted: 23.03.2021

 

 

 

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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