Infl uence of weather and climatic conditions of the vegetation period on susceptibility of soybean to peronosporosis

The infl uence of the weather and climatic conditions of the growing season on the prevalence and development of peronosporosis of the soybean in Western Siberia was studied. The studies took place during the growing seasons of 2014–2019. The objects of the research were SibNIIK-315 fodder soybean variety as well as diseases affecting leaves. The layout of the experiment involved conducting fi eld research in combination with mathematical methods for analyzing the data obtained. The parameters determining climatic conditions were the Selyaninov hydrothermal coeffi cient, average temperatures, and the amount of precipitation. For each year of the research, the Selyaninov hydrothermal coeffi cient was determined, a complex of soybean phytopathogens and their main types were identifi ed, the data on the annual prevalence and development of peronosporosis was obtained. The studies have shown the heterogeneity of the main factors affecting soybean. In this regard, it was found necessary to conduct a correlation analysis to identify the relationship between the moisture content of the growing season and soybean susceptibility. According to the results of the correlation analysis, a clear correlation was noted between the prevalence and development of peronosporosis and all the characteristics of the vegetation period in June. This may indicate a high role of the climatic conditions of this month in the formation of disease symptoms. There was a lack of correlation between the development of peronosporosis and the climatic conditions of July and August, which is explained by higher temperatures in these months in all the years of research. At the end of August – beginning of September there is a phase of full ripeness of soybean. In this period, the development of peronosporosis is diffi cult due to the physiological processes of plant wilting, therefore it was almost impossible to trace the connection between the development of the disease and climatic conditions.

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