Studies on the evaluation of some newer insecticides against of fall armyworm, Spodoptera frugiperda (J.E. Smith) on rabi maize

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 District, Bihar, which is a sub-campus of Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar. The research outcome revealed that the lowest mean larval population (0.40 larvae/plant), damage severity (1.67/ plant) with the maximum grain yield (7.59 t/ha) and highest benefit cost ratio (4.60:1) was recorded in plot treated with Chlorantraniliprole 18.5 SC @ 0.4 ml/l, followed by Emamectin benzoate 5SG @ 0.15 g/l, Lambda-cyhalothrin 9.5% + Thiamethoxam 12.6% ZC @ 0.25 ml/l, Lambda-cyhalothrin 5EC @ 1 ml/l were found effective insecticides than Azadirachtin 0.15% EC (1500 ppm) @ 5 ml/l, and carbofuran 3G @ 0.50 g/plant, Beauveria bassiana 2.5 WP @ 2 g/l were found least effective insecticides among all other treatments.