Vol. 11, Special Issue 10 (2022)

Author(s):
Tanweer Alam, Shivakumara MN, Rabindra Prasad and Ashish Narayan

Abstract:
The studies on “Population dynamics and management of fall armyworm, Spodoptera frugiperda (J.E. Smith) on rabi maize” was carried out under field conditions during Rabi 2020-21 at Agricultural Research Farm, Tirhut College of Agriculture, Dholi, Muzaffarpur, which is a sub-campus of Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar. The experimental outcome revealed that number of larval population and percent leaf damage of fall armyworm was started from 3^rd standard week of January to the third week of May. The peak activity of fall armyworm was observed in 12^th SMW of March 2021 with mean larval population and percent mean leaf damage of (4.8 larvae/plant) and (46.0% of percent leaf damage/plant) respectively, with the corresponding maximum temperature (35.6 °C), minimum temperature (17.7 °C), R.H. (%) at 07 (85.4%) and 14 hrs (46.2%), and rainfall (0.0 mm). The correlation analysis depicted that both larval population and percent leaf damage of fall armyworm, Spodoptera frugiperda were positively correlation with maximum temperature (°C) (r = 0.492^*) and (r = 0.498^*), respectively, and minimum temperature (°C) was positively correlation but no significant effect was observed on both larval population and percent leaf damage (r = 0.001) and (r = 0.020), and relative humidity (%) at 7 hours and 14 hours were negatively correlation and no significant effect on both larval population and percent leaf damage of S. frugiperda, (r = -0.225, r = -0.277) and (r = -0.401, r = -0.414), respectively, but rainfall was negatively correlation and significant effect on both larval population and percent leaf damage of fall armyworm (r = -0.475^*) and (r = -0.533^*) respectively.