Fungicidal Management Of Alternaria Leaf Blight Of Mustard In Foothills Of North Western Himalayas

Alternaria blight of mustard caused by Alternaria brassicae (Berk.) Sacc. and Alternaria brassicicola is one of the wide spread and destructive diseases of mustard in intermediate zone of Jammu region.All the five fungicides reduced the Alternaria blight of mustard in comparison to untreated control. The results showed that three sprayings at 15 days interval from 40 days after sowing showed minimum percent of leaf infection (14.35% in case of iprodione, followed by 18.35% in case of metalaxyl and 30.35% in case of mancozeb. Seed yield (q/ha) in iprodione sprayed plots was 9.35 q/ha followed by metalaxyl (8.65 q/ha and mancozedi.e 7.4 q/ha with maximum cost benefit ratio was 1:5.3, 1:4.2 and 1:3.8, respectively.