Bio-efficacy of newer insecticide molecules against okra fruit borer, Helicoverpa armigera

Abstract

To evaluate the effectiveness of newer insecticides in management of okra fruit borer, Helicoverpa armigera. A field experiment was conducted at Zonal Agricultural and Horticultural Research Station Navile, Shivamogga, Karnataka, India during kharif of 2015 To know the efficacy of various newer insecticides against Bhendi fruit borer, Helicoverpa armigera (Hub.) Among all the insecticides, the lowest mean larval number and fruit damage was noticed in Chlorantraniliprole 18.5 % SC (0.27 larvae/plant, 3.3%,) followed by Emamectin benzoate @0.36g/L(0.65 larvae/plant, 5.8%) and flubendiamide 480 SC(0.98 larvae/plant, 7.2%) respectively. Spinosad 45 SC and cyantraniliprole 10.26 OD were statistically on par with each other and all other treatments showed significantly superior over untreated check. Significant maximum yield of okra fruit was recorded from the plot sprayed with chlorantraniliprole 18.5%SC (89.25 q/ha) followed by Emamectin benzoate (85.06q/ha) and flubendiamide 81.25q/ha With respect to cost benefit ratio maximum was obtained from plot treated with chlorantraniliprole (1:3.56 followed by Emamectin benzoate (1:3.52).