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Ramularia collo-cygni  B. Sutton and J.M. Waller is a major disease in Austrian barley-growing regions. To date, fungicide application is the most effective method to manage the disease; however, fungicide resistance to demethylation and succinate dehydrogenase inhibitors has developed over the last few years. In the growing seasons 2016/2017 and 2017/2018, field trials were carried out to analyze the efficiency of fungicide strategies based on different fungicide classes. Disease development, growth parameters and monitoring of  CYP51  and  sdh  mutations were determined. Fungicide treatments resulted in higher disease control, green leaf area and grain yield. In Austrian  R. collo-cygni  field populations, the frequency of the mutations  CYP51 -I325T and  CYP51 -I328L was low to moderate. Frequency of mutations  sdhC -H146R and  sdhC -H153R was low. Frequencies of  CYP51 -I325T and -I328L were similar and increased following DMI application. Frequency of  sdhC -H146R was higher compared to  sdhC -H153R. The SDHI benzovindiflupyr showed a higher selection rate for  sdh  mutations compared to bixafen. These  sdh  mutations were not selected if chlorothalonil was used as mixing partner, leading to a stable composition of  sdh  resistance alleles over the last two years. Chlorothalonil was proven to be an effective tool for anti-resistance strategies. Currently, SDHIs and DMIs are the backbone of Ramularia leaf spot control in Austria; however, the level of resistance is likely to increase in absence of suitable anti-resistance strategies and following the ban of chlorothalonil.

journal of plant diseases and protection

Fungicide strategies and resistance of Ramularia collo-cygni to demethylation and succinate dehydrogenase inhibitors in Austrian winter barley (Hordeum vulgare)