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<p>Brown spot of rice caused by <i>Bipolaris oryzae</i> is a major constraint to rice productivity under diverse agro-ecological conditions. A comprehensive investigation was conducted during <i>Kharif</i> 2023 to assess disease status, host resistance and integrated management strategies under intermediate hill conditions of Jammu. Field survey across 28 villages of Udhampur, Ramban and Reasi districts revealed moderate disease prevalence, with mean disease severity ranging from 10.83 to 24.36%. Disease progression studies under different crop establishment methods indicated significantly higher disease severity and Area under Disease Progress Curve (AUDPC) in direct-seeded rice compared to transplanted crops, with maximum AUDPC (1489.95) recorded in direct sowing and minimum (1067.15) under mid-July transplanting. Screening of 103 advanced breeding lines identified eight resistant and fifteen moderately resistant lines, while the majority were susceptible. Among fungicides evaluated, Difenoconazole 25% EC proved most effective, recording minimum disease severity (20.25%) and highest grain yield (30.18 q ha⁻¹). Transplanting during the third week of July significantly reduced disease severity (18.60%) and enhanced yield (30.48 q ha⁻¹). The study demonstrates that integration of host resistance, optimum transplanting schedule and timely fungicide application provides an effective strategy for sustainable management of brown spot in hill ecosystems.</p>

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Epidemiology, host resistance and integrated management of brown spot disease (Bipolaris oryzae) in rice cultivated under intermediate hill conditions in Jammu

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • R. Lingeswari,
  • V. B. Singh,
  • Bupesh Kumar,
  • A. K. Singh

摘要

Brown spot of rice caused by Bipolaris oryzae is a major constraint to rice productivity under diverse agro-ecological conditions. A comprehensive investigation was conducted during Kharif 2023 to assess disease status, host resistance and integrated management strategies under intermediate hill conditions of Jammu. Field survey across 28 villages of Udhampur, Ramban and Reasi districts revealed moderate disease prevalence, with mean disease severity ranging from 10.83 to 24.36%. Disease progression studies under different crop establishment methods indicated significantly higher disease severity and Area under Disease Progress Curve (AUDPC) in direct-seeded rice compared to transplanted crops, with maximum AUDPC (1489.95) recorded in direct sowing and minimum (1067.15) under mid-July transplanting. Screening of 103 advanced breeding lines identified eight resistant and fifteen moderately resistant lines, while the majority were susceptible. Among fungicides evaluated, Difenoconazole 25% EC proved most effective, recording minimum disease severity (20.25%) and highest grain yield (30.18 q ha⁻¹). Transplanting during the third week of July significantly reduced disease severity (18.60%) and enhanced yield (30.48 q ha⁻¹). The study demonstrates that integration of host resistance, optimum transplanting schedule and timely fungicide application provides an effective strategy for sustainable management of brown spot in hill ecosystems.