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<p>Anthracnose of cucumber, caused by <i>Colletotrichum siamense</i> is the most common and destructive (pre- and post-harvest) disease. Farmers experienced significant losses in their rainy season crops due to this disease. Considering its economic impact, this study aimed to evaluate different fungicides for effective disease management under both laboratory and field conditions. Five fungicides were tested in vitro against <i>C. siamense</i> using the poison food technique at various concentrations. Among the tested fungicides, azoxystrobin 4.8% + chlorothalonil 40% SC was the most effective against <i>C. siamense</i> by inhibiting 86.59% of mycelial growth at a concentration of 500&#xa0;µg/ml. On the other hand, mancozeb 75% WP showed the least inhibition, 68.24% at the same concentration. Following the in vitro results, a field evaluation was conducted to identify the most effective fungicides. The azoxystrobin 4.8% + chlorothalonil 40% SC had a mean per cent disease index of 8.18 and 9.02 in 2023 and 2024, respectively, which was significantly lower than all other treatments. This treatment provided 61. 67% and 58. 60% disease control with the lowest AUDPC values of 210.73 and 224.56 in both years, respectively. The plots treated with this fungicide produced the highest yields of 315.38 and 293.96 quintals/acre, while the untreated control plots had the lowest yields of 180.33 and 173.96 quintals, during 2023 and 2024, respectively. Based on field evaluations, azoxystrobin 4.8% + chlorothalonil 40% SC is used as a preventive measure against anthracnose of cucumber. Post-harvest fruit wash with Generally Recognized as Safe (GRAS) compounds was also evaluated for post-harvest management of this disease. For postharvest management, fruit wash with acetic acid and hydrogen peroxide at concentrations of 100 and 150&#xa0;µg/ml was found to be highly effective against anthracnose of cucumber. UV-light treatment significantly delayed the symptom development and reduced disease severity of <i>C. siamense</i> on postharvest cucumber fruits.</p>

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In vitro and in vivo evaluation of fungicides and GRAS compounds against anthracnose disease of cucumber (Cucumis sativus L.)

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Jaspreet Kaur,
  • Ritu Rani,
  • Sandeep Jain

摘要

Anthracnose of cucumber, caused by Colletotrichum siamense is the most common and destructive (pre- and post-harvest) disease. Farmers experienced significant losses in their rainy season crops due to this disease. Considering its economic impact, this study aimed to evaluate different fungicides for effective disease management under both laboratory and field conditions. Five fungicides were tested in vitro against C. siamense using the poison food technique at various concentrations. Among the tested fungicides, azoxystrobin 4.8% + chlorothalonil 40% SC was the most effective against C. siamense by inhibiting 86.59% of mycelial growth at a concentration of 500 µg/ml. On the other hand, mancozeb 75% WP showed the least inhibition, 68.24% at the same concentration. Following the in vitro results, a field evaluation was conducted to identify the most effective fungicides. The azoxystrobin 4.8% + chlorothalonil 40% SC had a mean per cent disease index of 8.18 and 9.02 in 2023 and 2024, respectively, which was significantly lower than all other treatments. This treatment provided 61. 67% and 58. 60% disease control with the lowest AUDPC values of 210.73 and 224.56 in both years, respectively. The plots treated with this fungicide produced the highest yields of 315.38 and 293.96 quintals/acre, while the untreated control plots had the lowest yields of 180.33 and 173.96 quintals, during 2023 and 2024, respectively. Based on field evaluations, azoxystrobin 4.8% + chlorothalonil 40% SC is used as a preventive measure against anthracnose of cucumber. Post-harvest fruit wash with Generally Recognized as Safe (GRAS) compounds was also evaluated for post-harvest management of this disease. For postharvest management, fruit wash with acetic acid and hydrogen peroxide at concentrations of 100 and 150 µg/ml was found to be highly effective against anthracnose of cucumber. UV-light treatment significantly delayed the symptom development and reduced disease severity of C. siamense on postharvest cucumber fruits.