Fungicidal management of foliar diseases of mustard in mid-eastern India
2005
R.N. SINGH, R.B. SINGH and
Alternaria blight (AB), white rust (WR), and downy mildew (OM) of mustard caused by Alternaria brassicae, A. bressicicote; Albugo candida and Peronospora parasitica, respectively, occur severely across Uttar Pradesh, Bihar and Jharkhand. Seed treatment with Apron 35 SO @ 06g kg1 gave only marginal, though significantly superior, disease control and yield gain over untreated check with cost-benefit ratio of 1: 8.8. Seed treatment combined with three foliar sprays of Mancozeb 75% WP (0.2%) at 15 days interval, beginning 45 days after sowing, resulted in lowest AB, highest seed yield and cost-benefit ratio of 1:5.2. It was followed by foliar sprays of Mancozeb 75% WP alone in all respects. Highest avoidable losses due to the combined effect of these diseases in seed yield, seed test weight and oil content were 34.7,13.1 and 4.2%, respectively. NOR 8501 performed best under unprotected and Varuna under protected condition, former giving higher seedtest weight.
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