El-Nasharty, M., Yassin, A., Kamel, H., Alnaggar, A. (2025). Comparative Efficacy of Triazole, Benzimidazole, Antibiotic, and Copper-Based Fungicide Against Cercospora Leaf Spot, Cercospora beticola Infecting Sugar Beet in Egypt. Journal of Plant Protection and Pathology, 16(7), 365-370. doi: 10.21608/jppp.2025.393508.1347
M. E. A. El-Nasharty; Abeer S. Yassin; H. M. Kamel; A. M. Alnaggar. "Comparative Efficacy of Triazole, Benzimidazole, Antibiotic, and Copper-Based Fungicide Against Cercospora Leaf Spot, Cercospora beticola Infecting Sugar Beet in Egypt". Journal of Plant Protection and Pathology, 16, 7, 2025, 365-370. doi: 10.21608/jppp.2025.393508.1347
El-Nasharty, M., Yassin, A., Kamel, H., Alnaggar, A. (2025). 'Comparative Efficacy of Triazole, Benzimidazole, Antibiotic, and Copper-Based Fungicide Against Cercospora Leaf Spot, Cercospora beticola Infecting Sugar Beet in Egypt', Journal of Plant Protection and Pathology, 16(7), pp. 365-370. doi: 10.21608/jppp.2025.393508.1347
El-Nasharty, M., Yassin, A., Kamel, H., Alnaggar, A. Comparative Efficacy of Triazole, Benzimidazole, Antibiotic, and Copper-Based Fungicide Against Cercospora Leaf Spot, Cercospora beticola Infecting Sugar Beet in Egypt. Journal of Plant Protection and Pathology, 2025; 16(7): 365-370. doi: 10.21608/jppp.2025.393508.1347
Comparative Efficacy of Triazole, Benzimidazole, Antibiotic, and Copper-Based Fungicide Against Cercospora Leaf Spot, Cercospora beticola Infecting Sugar Beet in Egypt
1Department of Sugar Crops Pests and Diseases, Sugar Crops Research Institute, Agricultural Research Center, 12619 Giza, Egypt.
2Seed Pathology Research, Plant Pathology Research Institute, Agricultural Research Center, 12619 Giza, Egypt.
3Agriculture Botany Department, Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo 11884, Egypt.
Abstract
Two field trials were conducted at Hatthout Farm, Kafr El-Sheikh, during the 2023 and 2024 growing seasons to evaluate the effectiveness of four fungicides: Montoro®, Qomizo®, Kasumin® and Crunch®, against Cercospora leaf spot in sugar beet under Egyptian conditions. The trials used a randomized complete block design (RCBD) with four replications, and fungicides applied once at the early stage of infection (~2 % leaf area). Disease severity was monitored by counting lesions on leaves before and after treatment at intervals of 3, 7, and 10 days. Results indicated that all fungicide treatments significantly reduced lesions development compared to untreated plots. Montoro® and Kasumin® were particularly effective after 10 days, achieving lesion reductions of over 99 % in 2023. In 2024, Kasumin® and Qomizo® showed similarly high efficacy. Crunch® also performed well, reducing disease by over 98 %. The suppression of CLS resulted in notable improvements in crop growth and sugar quality, with Montoro® leading to increases in root weight, leaf number, and leaf area index by over 50-60 %. It also boosted total soluble solids and sucrose percentage, though not significant. All treatments increased sugar quality metrics, with Montoro®, Qomizo®, and Kasumin® significantly enhancing recoverable sugar and yield components, such as root and sugar yields, by around 50-80 %. Crunch® was less effective across most parameters. The findings indicate that rotating multiple fungicides with different modes of action within an IPM approach is essential for controlling CLS, delaying resistance, and preserving sugar beet yields in Egypt.
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