Exploration of fungicides against Alternaria leaf blight of cotton in Northern parts of Karnataka, India

Abstract

An investigation studies on Alternaria macrospora Zimm., causing leaf blight of Cotton was carried out at Agricultural Research Station, Dharwad Farm during kharif 2013 inorder to test the efficacy of chemical fungicides both invitro and invivo. Among the tested fungicides, Hexaconazole, Propiconazole and Avatar recorded cent percent inhibiton at all the test concentrations (0.05%, 0.075% and 0.1%). Invivo trials revealed that both Hexaconazole and Propiconazole at 0.1 percent concentration were found very effective in managing the disease by recording a kapas yield of 15.37 and 14.84 qtl/ha with a benefit cost ratio of 2.04 and 1.70, respectively.