为了明确三江平原地区大豆根腐病发生的严重程度,于2014年对该地区所属县、市及农场内大豆进行病害调查,计算发病率及病情指数。采集大豆根腐病样本,对病株样本进行真菌的分离及鉴定,共分离获得相关致病真菌3个属10个种。镰孢菌为优势菌群,其分离频率为29.92%。镰孢菌中,尖孢镰孢菌为优势种,其占分离镰孢菌总量的65.75%。调查结果表明,含水量大及重茬地块,大豆根腐病发病率及病情指数较高。 In order to clarify the severity of soybean root rot in the Sanjiang Plain, the disease investigation was carried out in the counties, cities and farms in the area in 2014, and the morbidity and disease index were calculated. The samples of soybean root rot were collected and the fungi were isolated and identified from the diseased plants. Three species of pathogenic fungi were isolated and identified. Fusarium is the dominant flora, the frequency of which is 29.92%. Among Fusarium, Fusarium oxysporum was the dominant species, accounting for 65.75% of the total Fusarium isolates. The survey results show that the water content and stubble plots, soybean root rot incidence and disease index higher.