Efficacy of fungicides against Alternaria blight disease of linseed (Linum usitatissimum)

The study on efficacy of fungicides against Alternaria blight disease of linseed caused by Alternaria lini was conducted at Research farm of Bihar agricultural university, Sabour, Bhagalpur (Bihar) during Rabi season of 2020-21 to select suitable fungicides against this disease. Six fungicides were evaluated in vitro and in vivo condition. The results revealed that all the tested fungicides showed significantly better performance to minimize the Alternaria blight disease over control. Among the tested fungicides, Propiconazole 25 EC proved the best at all the concentrations (100, 150 and 200 ppm) as it showed 100% of mycelial growth inhibition over control. In the field condition too, Propiconazole 25EC proved superior among all the fungicides with the lowest disease severity (10.66%). It showed the highest disease control over check (77.6 %) and also highest yield (884.33 kg ha-1) which was followed by Azoxystrobin 23%SC and Carbendazim 12% + Mancozeb 63% WP.