Chemical control options for common bean rust, caused by Uromyces appendiculatus
Magdalena Koleva
Abstract: The aim of this study is to determine the efficiency of fungicides based on: azoxystrobin, difenoconazole, pyraclostrobin + boscalid, and Bordeaux mixture for control bean rust, caused by Uromyces appendiculatus in a single application. The varieties “Skytia” and “Dobrudzhanski 7” were used. Two assessments were made: when uredinia appeared on the variants and 14 days after application of the fungicides. The Disease intensity (DI), Area under disease progress curve (AUDPC) (adaxial/abaxial) and Еfficiency (E) of the fungicides were calculated. In 2023 AUDPC values were highest in the control variant (65.18/64.56), followed by Bordeaux mixture (35.48/37.42), difenoconazole (22.86/21.45), azoxystrobin (18.74/20.32) and pyraclostrobin + boscalid (18.84/20.26). The DI of the control was 34.26%, followed by Bordeaux mixture (32.96%), pyraclostrobin+boscalid (12.85%), difenoconazole (9.56%) and azoxystrobin (7.88%). The highest E was shown by azoxystrobin (78%), followed by difenoconazole (72.1%), pyraclostrobin + boscalid (62.5%) and Bordeaux mixture (3.76%). In 2024 AUDPC values are highest in the variant treated with Bordeaux mixture (195.64/186.75), followed by the control (189.00/183.40). The lowest AUDPC is found in azoxystrobin (52.60/51.90), followed by difenoconazole (58.23/65.10) and pyraclostrobin + boscalid (145.60/173.60). DI is highest in Bordeaux mixture (66.24%), followed by control (65.34%), pyraclostrobin+boscalid (44.58%), and lowest in azoxystribin (25.36%) and difenoconazole (35.68%). Efficiency of the fungicides in 2024 is the highest for azoxystrobin (61.19%), followed by difenoconazole (45.39%), pyraclostrobin+boscalid (31.77%). Bordeaux mixture does not show efficiency against bean rust in 2024. The analysis of variance for the two years shows a significant difference of both the independent action of the factors studied (year, reporting period, fungicide) and their interaction with respect to both AUDPC and DI.
Keywords: common bean; fungicides; P. vulgaris
Citation: Koleva, M. (2025). Chemical control options for common bean rust, caused by Uromyces appendiculatus. Bulgarian Journal of Soil Science Agrochemisty and Ecology, 59(2), 61-72 (Bg).
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| Date published: 2025-06-25
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