BIOEFFICACY OF CHEMICAL INSECTICIDES AGAINST EARIAS VITTELLA (FABRICIUS) ON OKRA

摘要

A field experiment was conducted to determine the efficacy of eleven chemical treatments against Earias vittella (Fabricius) infesting okra at Junagadh Agricultural University campus, Junagadh during kharif season of 2006. Among tested insecticides, profenophos + cypermethrin (0.044%), chlorpyriphos + cypermethrin (0.055%), cypermethrin 0.006% and profenophos 0.05%, were found to be the most effective in reducing the fruit infestation to 6.47 to 10.52 % against 43.5% in the control. The highest yield of healthy fruits was recorded in the treatment of profenophos + cypermethrin 0.044% (2366.3 kg/ha) followed by chlorpyriphos + cypermethrin 0.055% (2155.4 Kg/ha), cypermethrin 0.006% (2127.1 Kg/ha) and profenophos 0.05% (2103.9 Kg/ha). The highest cost benefit ratio (1: 20.3) was obtained in the treatment of cypermethrin 0.006%, followed by profenophos + cypermethrin (1:11.9), chlorpyriphos (1:10.4), chlorpyriphos + cypermethrin (1:10.2), profenophos (1:8.7), acephate (1:5.1) and methomyl (1:4.1).