Toxicity and sub lethal effects of diamide insecticide (Cyantraniliprole 10.26 OD) on the biology of Diamondback moth, Plutella xylostella L. (Lepidoptera: Plutellidae)

Toxicity of Cyantraniliprole to the diamondback moth Plutella xylostella L. was assessed using leaf dip bioassay method. The results of the probit regression analysis of mortality data revealed that the LC ₂₅, LC ₅₀ and LC ₇₅ for 72 h, was 0.00012 ppm, 0.00708 ppm and 0.40624 ppm, respectively. The mean slope value of the probit regression analysis was 0.3835. The effects of sub lethal concentrations of Cyantraniliprole 10.26 OD applied at LC₂₅, LC₅₀ and LC₇₅ on the biological characteristics of the diamondback moth, P. xylostella were investigated, which shown the extended development time of all life stages, reduced larval weight, pupation rate, pupal weight, adult emergence, oviposition period, fecundity and fertility and higher number of malformed adults with the increased concentration of the insecticide. The net reproductive rate, intrinsic rate of increase and finite rate of increase of P. xylostella were significantly reduced when treated with increasing doses of Cyantraniliprole compared to control. The results suggest that sub lethal concentrations of Cyantraniliprole reduce population growth of P. xylostella by affecting its survival, development and reproduction.