Residual toxicity of different insecticides against brinjal shoot and fruit borer Leucinodes orbonalis Guenee (Lepidoptera: Pyralidae)

Abstract

Five new molecule insecticides viz., chlorantraniliprole, cyantraniliprole, indoxacarb, lambda-cyhalothrin and thiacloprid were bio-assayed against neonates of Leucinodes orbonalis to study the residual toxicity on brinjal at CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur during the kharif 2015 and 2016. Chlorantraniliprole 0.007 percent showed highest Persistent Toxicity (PT) values of 449.16 and 437.50 and LT50 values to the tune of 5.16 and 4.99 days during 2015 and 2016, respectively as compared to other insecticides. The lowest PT values to the tune of 297.48 and 309.16 and LT50 values to the tune of 2.41 and 2.61 days were recorded by indoxacarb 0.01 per cent during 2015 and 2016, respectively. On the basis of average PT values, the order of toxicity was chlorantraniliprole > cyantraniliprole > thiacloprid > lambda-cyhalothrin > indoxacarb against neonates of L. orbonalis.