Toxicity of some insecticides against Agrotis spp. infesting cabbage Rimpy*, Verma K S Department of Entomology, Chaudhary Sarwan Kumar Himachal Pradesh Krishi Vishvavidyalaya, Palampur, 176062, Himachal Pradesh *Email: rimpynanglia@gmail.com (corresponding author)
Online published on 18 April, 2020. Abstract Toxicity of seven insecticides viz., bifenthrin, chlorantraniliprole, cypermethrin, emamectin benzoate, flubendiamide, novaluron and spinosad was evaluated through leaf dip and topical methods of bioassay against third instar larvae of Agrotis ipsilon (Hufnagel) and A. segetum (Denis and Schiffermuller). Based on LC50 values, chlorantraniliprole was found the most effective against third instar larvae of A. ipsilon (0.0298 ppm) as well as A. segetum (0.0321 ppm) while cypermethrin was the least effective, with LC50 values of 31.0706 and 33.4636 ppm, respectively. On the basis of LD50, chlorantraniliprole was observed to be the most effective against third instar larvae of A. ipsilon (0.00086 μg a.i./larva) as well as A. segetum (0.00085 μg a.i./larva) while novaluron being the least effective with LD50 values 0.8382 and 0.7441 μg a.i./larva, respectively. Top Keywords Agrotis ipsilon, A. segetum, cabbage, bioassay, leaf dip, topical application, LC50, LD50, chlorantraniliprole, novaluron, cypermethrin, efficacy. Top |