Efficacy of insecticides and plant extracts against Helicoverpa armigera through artificial diet bioassay

In present studies, two insecticides Emamectin benzoate 5% SG and Chlorantraniliprole 18.6% SC as well as the botanical Nirgundi oil were tried in Diet bioassay. Results showed that 95.60% control was recorded in T₃ (Emamectin benzoate 5 SG @ 11 g a.i./ha), which provided highest control amongst all treatments against H. armigera. Second highest control was obtained with observed with T₂ (Chlorantraniliprole 200 SC @ 30 g a.i./ha) followed by T₈ (Emamectin benzoate 5 SG @ 8.25 g a.i./ha + Nirgundi oil @ 6%) and T₇ (Chlorantraniliprole 200 SC @ 22.5 g a.i./ha + Nirgundi oil @ 6%), being 95.30, 95.00 and 94.40% respectively. These results revealed that synergistic activity of insecticides and plant extract can reduce one fourth dose of recommendation by producing similar efficacy to the recommended dose. This study shows that employing plant extracts like Nirgundi oil may successfully control H. armigera.