大豆根腐病在黑龙江省各农场发生普遍,一般减产10％左右,是一个新的严重威胁大豆生产的病害。此病系由尖孢镰刀菌,燕麦镰刀菌、腐霉菌和立枯丝核菌引起。从种子萌发后7—10天即可侵染幼根,以后随着生育期加长,病情逐渐加重,花荚期达到高峰。发病与土壤温度、湿度关系密切,同时,受茬口、栽培方式、肥料种类及根部害虫危害影响。大豆品种间抗病性有明显差异,但尚未发现高抗品种。在药剂防治方面,多菌灵与福美双或克菌丹混合拌种,对提高保苗率、减轻病情作用较大。被认为是一种简单易行经济有效的防治方法。 Soybean root rot is common in all farms in Heilongjiang Province, with a general reduction of about 10%. It is a new disease that seriously threatens soybean production. The disease is caused by Fusarium oxysporum, Fusarium ovale, Pythium and Rhizoctonia solani. 7-10 days after seed germination can be infected with young roots, then grow with the growing period, the condition gradually aggravated, flower pod peaked. Incidence and soil temperature and humidity are closely related, at the same time, affected by stubble, cultivation methods, types of fertilizers and root pest damage. There were significant differences in disease resistance among soybean varieties, but no high resistant varieties were found yet. In the prevention and treatment of pesticides, carbendazim and thiram or cloacan mixed seed dressing, to improve the seedling rate, reduce the effect of the larger. Is considered to be a simple and cost-effective method of prevention and treatment.