Comparative effectiveness of neonicotinoids, green nanoparticles and botanicals against Plutella xylostella (Lepidoptera: Plutellidae) on cabbage

Abstract

Laboratory and field efficacy of certain neonicotinoids, green nanoparticles and botanicals is reported against diamondback moth (DBM), Plutella xylostella. In laboratory bioassay, the LC50 of chlorantraniliprole, novaluron, flubendiamide, silver nanoparticles (np), zinc np, neem oil, tulsi extract, dhatura extract and imidacloprid (standard check) were found to be 0.004, 0.008, 0.005, 0.039, 0.013, 0.893, 0.615, 0.738 and 0.001 per cent respectively after 24 h of exposure and 0.040, 0.006, 0.100, 0.028, 0.008, 0.116, 0.092,0.133 and 0.069 per cent respectively after 48 h. The order of toxicity to DBM on the basis of LC50 values was imidacloprid> chlorantraniliprole>flubendiamide>novaluron> zinc np> silver np>tulsi extract >dhatura extract >neem oil for the exposure period of 24 h and novaluron> zinc np> silver np> chlorantraniliprole> imidacloprid>tulsi extract >flubendiamide>neem oil >dhatura extract for the exposure period of 48 h respectively. In field application, chlorantraniliprole10 g ai ha⁻¹ was the most effective in bringing down the population of DBM (78.70, 82.00, 87.50, 86.40 and 85.30 per cent) at 1,3,5,7 and 15 d after spraying (DAS) respectively, while the lowest population reduction (12.50, 17.00, 15.90, 15.90 and 13.60 per cent) was found with dhatura extract 0.2 mLL⁻¹ at 1, 3, 5, 7 and 15 DAS.