Knowledge of potential pest risks is essential for soybean disease control planning. The purpose of this study is to obtain actual information about the patterns of the spread of diseases in soybean fields in the Amur region, as well as the influence of various factors, such as wild vegetation near the field, weather, etc. The author shows the results of field and laboratory studies from 2019 to 2022. The distribution and density of soybean diseases in different areas of the Amur region and the species composition of soybean diseases were studied. Mathematical processing of the obtained data was carried out by the method of calculating the Euclidean metric. Clustering of local lists of types of fungal diseases was performed on the basis of the obtained calculations. The most common disease is septoriose (Septoria glycines). The rarest disease is sclerotiniose (Sclerotinia sclerotiorum). A new disease for the territory of the Amur region was discovered: soybean stem cancer (Diaporthe phaseolorum var. caulivora). The pathogen agent weakens the plant, so fusarium becomes diffuse form and causes tracheomycosis wilt of soybean plants. The dependence of the density and spread of soybean diseases on the following factors was revealed: the composition of the adjacent wild plants, the degree of isolation of the field, and local weather conditions.The degree of isolation and quarantine measures have the greatest influence on the spread of cercosporosis (Cercospora sojina). Powdery mildew (Erysiphe communis) is highly sensitive to local weather and climate conditions. Septoriose (Septoria glycines) weakly responds to these factors. Throughout the region, this disease is widespread and has a high density in soybean crops.

Kuzmin Alexander A.

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