author(s)
Gajanand Nagal, VK Agrawal and AS Baloda

abstract
A laboratory trial was conducted with seven insecticide molecules to identify the most efficacious compounds against beetles of Holotrichia consanguinea Blanch. during 2016 at RARI, Durgapura. The results of bioassay affirmed bifenthrin 10 EC as the most effective insecticide in terms of toxicity followed by fipronil + imidacloprid 80 WG, clothianidin 50 WDG, imidacloprid 17.8 SL, fipronil 80 WG, imidacloprid 600 FS and quinalphos 25 EC with LC₅₀ values 0.08, 0.20, 0.76, 0.77, 1.44, 1.53 and 36.58 ppm, respectively. The relative toxicity of different insecticides on the basis of LC₅₀ value to beetles by AVT demonstrated that bifenthrin 10 EC, fipronil + imidacloprid 80 WG, clothianidin 50 WDG, imidacloprid 17.8 SL, fipronil 80 WG and imidacloprid 600 FS were 457.25, 182.90, 48.14, 47.51, 25.40 and 23.91 times more toxic than quinalphos 25 EC.