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<p>Angular leaf spot (ALS), caused by <i>Pseudocercospora griseola</i>, is reported to cause serious yield losses in common beans worldwide. The study evaluated the effectiveness of integrated effects of host resistance and fungicide spray frequency on ALS development, nodulation, agronomic trats, and yield loss in southern Ethiopia in 2021 and 2022. Fourteen treatments were tested in a factorial randomized complete block design with three replications. Significant (<i>P</i> &lt; 0.01) variations were observed among treatments for disease components, nodulation, and agronomic traits. The Hawassa Dume variety treated with three applications of Benomyl had the lowest disease incidence (23.23%), final severity (17.59%), AUDPC (797.84%-day), along with the highest grain yield (2999.70&#xa0;kg ha<sup>‒1</sup>). Production of Hawassa Dume with the same treatment resulted in the highest net benefit of $1954.7 ha<sup>‒1</sup> and a marginal rate of return of 20.1 compared to unsprayed plots. However, the highest total (139.79) and effective (133.99) number of nodules were recorded from Red Wolaita variety combined with three foliar applications of Benomyl. Moreover, three times Benomyl applications caused yield increases of 169.78 and 184.37% were recorded for Hawassa Dume and Red Wolaita, respectively, over their unsprayed plots. Correlation analysis indicated positive relationships among the disease and agronomic traits and negative correlations between the disease and agronomic traits, while regression analysis showed significant yield reduction with increasing ALS progression across treatments. Thus, employing Hawassa Dume and partly Red Wolaita with three-time Benomyl application proved the most effective and economically viable for reducing ALS, enhancing yield, nodulation, and other agronomic traits, minimizing yield losses, and attaining the highest economic returns. Therefore, it could be recommended for farmers to manage ALS in the study areas and similar agroecologies to sustain common bean productivity.</p>

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Associations of angular leaf spot (Pseudocercospora griseola) epidemics and yield losses in common bean as influenced by integration of variety and fungicide spray frequency

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Getachew G. Mengesha,
  • Habtamu Terefe,
  • Getnet Yitayih,
  • Erana Kebede,
  • Asnake Abera,
  • Abu Jambo,
  • Sultan M. Yimer

摘要

Angular leaf spot (ALS), caused by Pseudocercospora griseola, is reported to cause serious yield losses in common beans worldwide. The study evaluated the effectiveness of integrated effects of host resistance and fungicide spray frequency on ALS development, nodulation, agronomic trats, and yield loss in southern Ethiopia in 2021 and 2022. Fourteen treatments were tested in a factorial randomized complete block design with three replications. Significant (P < 0.01) variations were observed among treatments for disease components, nodulation, and agronomic traits. The Hawassa Dume variety treated with three applications of Benomyl had the lowest disease incidence (23.23%), final severity (17.59%), AUDPC (797.84%-day), along with the highest grain yield (2999.70 kg ha‒1). Production of Hawassa Dume with the same treatment resulted in the highest net benefit of $1954.7 ha‒1 and a marginal rate of return of 20.1 compared to unsprayed plots. However, the highest total (139.79) and effective (133.99) number of nodules were recorded from Red Wolaita variety combined with three foliar applications of Benomyl. Moreover, three times Benomyl applications caused yield increases of 169.78 and 184.37% were recorded for Hawassa Dume and Red Wolaita, respectively, over their unsprayed plots. Correlation analysis indicated positive relationships among the disease and agronomic traits and negative correlations between the disease and agronomic traits, while regression analysis showed significant yield reduction with increasing ALS progression across treatments. Thus, employing Hawassa Dume and partly Red Wolaita with three-time Benomyl application proved the most effective and economically viable for reducing ALS, enhancing yield, nodulation, and other agronomic traits, minimizing yield losses, and attaining the highest economic returns. Therefore, it could be recommended for farmers to manage ALS in the study areas and similar agroecologies to sustain common bean productivity.