Author(s):

Neeraj Kumar Rajvanshi, HK Singh and Manish Kumar Maurya

Abstract: Alternaria blight caused by Alternaria brassicae (Berk) Sacc. and A. brassicicola (Schw) Wiltshire is one of the most devastating disease on rapeseed-mustard causing major economic losses. The field experiments were conducted during 2017-18 and 2018-19 to evaluate combo of seed treatment and foliar sprays of bio-agents and fungicides. Treatment T₈ i.e. ST with Thiram 2.5 g/kg seed + 3 spray of Nativo @ 0.05% was found most effective with minimum mean disease severity 13.27% followed by T₂- ST with P. fluorescence @ 6.0 g/kg seed + 3 spray of Nativo @ 0.05% with severity 17.66%, T₁₂- ST with Thiram 2.5 g/kg seed + 3 spray of Folicur @ 0.2% (21.40%), T₆- ST with P. fluorescence @ 6.0 g/kg seed + 3 spray of Folicur @ 0.2% (24.05%), T₉- ST with Thiram 2.5 g/kg seed + 3 spray of Propiconazole @ 0.1% (25.93%). Maximum yield (Kg/ha) and increase in yield was found in T₈ 1672.22 kg/ha and 70.05% respectively followed by T₂ (1627.77; 65.63%), T₁₂ (1594.44; 62.14%), T₆ (1561.11; 58.75%), T₉ (1544.44; 57.06%). The highest yield loss was avoided by T₈ (41.19%) followed by T₂ (39.55%), T₁₂ (38.32%), T₆ (37.01%), T₉ (36.33%). The maximum cost benefit ratio was found in T₉ (1:3.60) followed by T₃ (1:3.38), T₈ (1:2.48), T₂ (1:2.32), T₁₁ (1:2.03).

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