Vol. 13 No. 3
Disease reaction of canola type mustard (Brassica juncea L.) genotypes against Alternaria blight caused by Alternaria brassicae (Berk) Sacc. in West Bengal
Author(s): R. Das, A. Dutta And K. N. Mandal
Abstract: The study was conducted with the objective to assess the resistance source against Alternaria blight in Canola type mustard during Rabi, 2015-16. Nineteen Canola type mustard germplasms were naturally screened against Alternaria blight under field conditions. None of the entries was found immune or highly resistant or resistant. Significant variability in the severity of the disease was observed among genotypes. The per cent disease severity ranged from 24.44-64.44 % leaf stage and 12.22-63.33% at pod stage. Only two genotypes i.e., PM-22 and PM-28 showed lower severity of Alternaria blight at leaf as well siliqua stage and fall under moderately resistant group (Disease severity 11% to 25%). Nine germplasms were categorized as susceptible (Disease severity 26% to 50%) and susceptible check Varuna was found as highly susceptible (Disease severity > 50%). These two moderately resistant genotypes can be used as good donor for evolving resistant varieties against Alternaria blight in Canola type mustard.
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