author(s)
Atanu Seni and Bhima Sen Naik

abstract
Laboratory bioassay of eight insecticides namely Chlorpyriphos 20 EC, Ethiprole+ imidacloprid 80 WG, Pymetrozine 50 WP, Lamda cyhalothrin 4.9 CS, Imidacloprid 30.5 SC, Acephate 95 SG, Thiacloprid 240 SC and Fipronil 5 SC was conducted in the Regional Research and Technology Transfer Station (OUAT), Chiplima, Odisha against mustard aphid, Lipaphis erysimi (Kalt.) using leaf dip method in Feb-March, 2016. Among insecticides, chlorpyriphos 20 EC was the most toxic (LD₅₀ 5.38 ppm) followed by imidacloprid 30.5 SC (LD₅₀ 22.14 ppm), ethiprole+ imidacloprid 80 WG (LD₅₀ 22.94 ppm), thiacloprid 240 SC (LD₅₀ 27.17 ppm), pymetrozine 50 WP (LD₅₀ 25.59 ppm), Lamda cyhalothrin 4.9 CS (LD₅₀ 31.34 ppm), acephate 95 SG (LD₅₀ 111.22 ppm), fipronil 5 SC (LD₅₀ 234.15 ppm).