Abstract
BACKGROUNDMetyltetraprole is a new fungicide with a unique tetrazolinone‐moiety and a similar side chain to a known quinone outside inhibitor (QoI), pyraclostrobin. In this study we describe a unique bioactivity of metyltetraprole on QoI‐resistant strains of Zymoseptoria tritici and Pyrenophora teres.RESULTSMetyltetraprole exhibited potent antifungal activity against Ascomycetes; it was especially effective against Z. tritici and P. teres in seedling pot tests. Metyltetraprole was also effective in field tests with QoI‐resistant mutants. Antifungal activity tests using field strains of Z. tritici and P. teres showed that the performance of metyltetraprole was unaltered by QoI, succinate dehydrogenase inhibitor (SDHI), and sterol 14α‐demethylation inhibitor (DMI) resistance. However, the mitochondrial activity test indicated that the compound inhibits the respiratory chain via complex III.CONCLUSIONMetyltetraprole is a novel fungicide that is highly effective against a wide range of fungal diseases, including important cereal diseases. Although metyltetraprole most likely inhibits the respiratory chain via complex III, it remains effective against QoI resistant strains. Therefore, metyltetraprole is considered as a novel fungicidal agent for controlling diseases affecting cereal crops and overcoming pathogen resistance to existing fungicides. © 2018 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Highlights
Wheat and barley production in Europe is approximately 330 million metric tons per year, accounting for 40% of the global production (2016, FAOSTAT http://www.fao.org/faostat/en/#home)
Septoria leaf blotch and net blotch are the most devastating foliar diseases in cereal crop production on this continent.[1–3]. The former, which is caused by Zymoseptoria tritici, can result in up to 50% of losses in yield in the case of severe epidemics,[4] whereas barley production can be reduced by 10–40% by Pyrenophora teres, which is the causal agent of net blotch.[5]
Metyltetraprole is characterized by its tetrazolinone moiety and the methyl group on the central bridging ring albeit it has the same phenylpyrazole side chain as pyraclostrobin
Summary
Wheat and barley production in Europe is approximately 330 million metric tons per year, accounting for 40% of the global production (2016, FAOSTAT http://www.fao.org/faostat/en/#home). Septoria leaf blotch and net blotch are the most devastating foliar diseases in cereal crop production on this continent.[1–3]. The former, which is caused by Zymoseptoria tritici, can result in up to 50% of losses in yield in the case of severe epidemics,[4] whereas barley production can be reduced by 10–40% by Pyrenophora teres, which is the causal agent of net blotch.[5]. Metyltetraprole is a new fungicide with a unique tetrazolinone-moiety and a similar side chain to a known quinone outside inhibitor (QoI), pyraclostrobin. In this study we describe a unique bioactivity of metyltetraprole on QoI-resistant strains of Zymoseptoria tritici and Pyrenophora teres
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