大豆根腐病是世界大豆产区普遍发生的一种土传病害,也是严重危胁黑龙江省大豆生产的重要病害之一。每年发病面积在一千万亩以上,严重地块发病率高达90%左右,常年因病减产10—30%左右。在病害调查及病原菌种类鉴定的基础上,自1984—1988年我们对病原菌的致病性以及侵染、发病规律作了初步探讨,结果如下。 Soybean root rot is a soil-borne disease commonly occurring in soybean producing areas in the world and is also one of the important diseases that seriously threaten soybean production in Heilongjiang Province. The annual incidence of disease in more than 10 million mu, the incidence of serious block up to 90%, 10-30% annual reduction due to disease. Based on the survey of disease and the identification of pathogenic bacteria, we made a preliminary study on the pathogenicity of pathogens and the pathogenesis of infection from 1984 to 1988 with the following results.