Author(s):

ADG Grace, Prasada Rao GMV, Krishnayya PV, Manoj V and Srinivasa Rao V

Abstract: Resistance in Kurnool population of S. litura was monitored during 2016-17 and 2017-18 by leaf dip assay conducted at RARS, Lam. The insecticides used in the bioassay are diamide group of insecticides viz., chlorantraniliprole, flubendiamide, Avermectin insecticide: emamectin benzoate, Carbamate insecticide: thiodicarb, IGR: Novaluron, Organophosphorous group: chlorpyriphos and a pyrethroid: cypermethrin. The LC₅₀ values recorded were 0.072, 0.023, 0.103, 0.120, 0.113, 1.486 and 2.570 ppm during 2016-17 and 0.093, 0.031, 0.113, 0.132, 0.108, 1.580 and 3.047 respectively during 2017-18. The Resistant Ratios (RR) ranged from 1.63 to 2.11 for chlorantraniliprole, 1.53 to 2.06 for flubendiamide, 1.51 to 1.66 for emamectin benzoate, 3.07 to 3.38 for thiodicarb, 3.4 to 3.27 for novaluron, 25.62 to 27.24 for chlorpyriphos and 38.35 to 45.4 for cypermethrin.

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