Bioefficacy of certain new insecticide molecules against spotted pod borer, Maruca vitrata (lepidoptera: crambidae) of cowpea

Studies on the management of resistant populations of Maruca vitrata (F.) revealed that 100% mortality was recorded in the population treated with spinosad 75 g a.i. ha⁻¹, emamectin benzoate 10 g a.i. ha⁻¹ and indoxacarb + acetamiprid 100 g a.i. ha⁻¹ after 12 h of treatment under laboratory trial. No significant difference was observed in the mortality when treated with chemicals like chlorantraniliprole 30 g a.i. ha⁻¹, indoxacarb 60 g a.i. ha⁻¹, flubendiamide 100 g a.i. ha⁻¹ and acephate + imidacloprid 518 g a.i. ha⁻¹ which showed a per cent mortality of 93.33 per cent each and less mortality was recorded in population sprayed with chlorpyriphos 600 g a.i.ha⁻¹ (20%) and novaluron 100 g a.i. ha⁻¹ (33.33%) after 24 h of treatment under laboratory trial.