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Summary Leaf spot caused by Cercospora beticola is one of the most serious diseases of sugar beet. Various fungicide groups are used to control this disease and among them also strobilurin based products. The aim of the study was to analyze the causes of strobilurin resistance of C. beticola isolates collected in Wielkopolska region. The strobilurin inhibits mitochondrial respiratory processes and mutations occurring in the cytochrome b gene (cytb) are the most important reason of C. beticola strobilurin resistance. An increasing activity of an alternative oxidase (AOX) also plays an important role in resistance occurring in C. beticola isolates. The sequence of cytochrome b gene of C. beticola isolates were analyzed. Mutations G143 and F129L – the main determinants of strobilurin resistance were no found. However, an increased strobilurin resistance level of the isolates is caused by higher activity of alternative oxidase, which replaces the function of cytochrome b in the respiratory pathway.

The reasons of strobilurin resistance of Cercospora beticola (cercospora leaf spot) isolates in Wielkopolska region