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<p>Sunflower is an important oilseed crop is attacked by various diseases, among which leaf blight caused by <i>Alternaria helianthi</i> (Hansf.) Tubaki and Nishihara is the major one. The present study was undertaken to understand the influence of weather parameters on severity of leaf blight of sunflower and to identify effective integrated management strategy against sunflower leaf blight during <i>kharif</i> (Rainy season) season of the year 2022 (June to September, rainy season in India), <i>rabi</i> season (Winter season) of the year 2022-23 (November to February, winter season in India) and <i>kharif</i> 2023-24 (Rainy season) in India at Main Agricultural Research Station, UAS, Dharwad. The weather parameter temperature maximum had positive correlation with leaf blight severity in all three trials, while RHmax, RHmin, Rainfall, number of rainy days (1 rainy day means a day with rainfall of 2.5&#xa0;mm or more), sunshine hours and average sunshine hours had positive correlation during <i>kharif</i> 2022-23 (Rainy season) and <i>rabi</i> 2022-23 (Winter season). However, all other factors had negative correlation in respective season. Among different treatment combinations, T<sub>2</sub> treatment involving three sprays of Captan 70% + Hexaconazole 5% WP (0.2%) at 15 days interval starting from 30 days after sowing was found to be most effective and superior than rest of the treatments in all three seasons (34.11%, 7.54% and 28.22% disease index, respectively). The same treatment recorded highest head diameter (15.65&#xa0;cm, 17.40&#xa0;cm and 16.61&#xa0;cm, respectively), 100 seed weight (8.55&#xa0;g, 9.75&#xa0;g and 8.88&#xa0;g, respectively) with highest Benefit: Cost ratio of 2.31. Three sprays of plant extracts (T<sub>4</sub>) was the least effective treatment apart from control which showed highest leaf blight severity, lowest head diameter, 100 seed weight and seed yield. From the study it was found out that, late sowing of crop (from September) or growing sunflower as winter and summer season crop with need based spray of Captan 70% + Hexaconazole 5% WP is more beneficial with less/no risk of <i>Alternaria</i> leaf blight.</p>

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Challenging the Alternaria, great havoc of concern to many crop plants with special reference to sunflower- epidemiology and integrated management

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Ajith C R,
  • Sudheendra A. Ashtaputre,
  • Laxminarayana Rao M. S.,
  • Vijayakumar A. Giritammannavar,
  • Milind P. Potdar,
  • Ramaraddi N. Madalli,
  • Deepika Gakhar,
  • Deepak Bhanot,
  • Anurag Malik

摘要

Sunflower is an important oilseed crop is attacked by various diseases, among which leaf blight caused by Alternaria helianthi (Hansf.) Tubaki and Nishihara is the major one. The present study was undertaken to understand the influence of weather parameters on severity of leaf blight of sunflower and to identify effective integrated management strategy against sunflower leaf blight during kharif (Rainy season) season of the year 2022 (June to September, rainy season in India), rabi season (Winter season) of the year 2022-23 (November to February, winter season in India) and kharif 2023-24 (Rainy season) in India at Main Agricultural Research Station, UAS, Dharwad. The weather parameter temperature maximum had positive correlation with leaf blight severity in all three trials, while RHmax, RHmin, Rainfall, number of rainy days (1 rainy day means a day with rainfall of 2.5 mm or more), sunshine hours and average sunshine hours had positive correlation during kharif 2022-23 (Rainy season) and rabi 2022-23 (Winter season). However, all other factors had negative correlation in respective season. Among different treatment combinations, T2 treatment involving three sprays of Captan 70% + Hexaconazole 5% WP (0.2%) at 15 days interval starting from 30 days after sowing was found to be most effective and superior than rest of the treatments in all three seasons (34.11%, 7.54% and 28.22% disease index, respectively). The same treatment recorded highest head diameter (15.65 cm, 17.40 cm and 16.61 cm, respectively), 100 seed weight (8.55 g, 9.75 g and 8.88 g, respectively) with highest Benefit: Cost ratio of 2.31. Three sprays of plant extracts (T4) was the least effective treatment apart from control which showed highest leaf blight severity, lowest head diameter, 100 seed weight and seed yield. From the study it was found out that, late sowing of crop (from September) or growing sunflower as winter and summer season crop with need based spray of Captan 70% + Hexaconazole 5% WP is more beneficial with less/no risk of Alternaria leaf blight.