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

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.