从我国六个省的花生青枯病发生地区采集的36个花生青枯菌分离株,通过对六个不同抗病性的鉴别品种进行人工接种表明,所有菌株对鉴别品种均具有不同程度的致病力,菌株致病性分化十分明显。根据致病性的不同反应,可以划分为7个致病型,其中的V型和Ⅱ型出现率最高达36.1%和25%。且分布地区相当广泛,为我国花生青枯菌占优势的致病型。试验证明,我国南方病区菌株的致病力普遍比北方强;同一地区可以有不同致病型菌株混合存在;同一母株在不同的地理环境影响下,致病力会发生变化。通过7个省13处自然病圃的品种抗病性鉴定表现,所获结果与人工接种结果基本相同。只是在自然环境条件影响下,菌系的致病性分化更为复杂,出现的致病型更多。本试验为青枯菌系的研究,深入开展花生抗青枯病鉴定,发掘新抗源,加快抗病育种工作进程以及设计综合防治技术措施提供了依据。 Thirty-six strains of R. solanacearum isolates collected from peanut bacterial wilt areas in six provinces of China were artificially inoculated with six different cultivars with different disease resistances. All of the isolates showed different degrees of susceptibility to the identified cultivars Pathogenicity, pathogenicity of the strain is very obvious. According to the different pathogenic responses, it can be divided into seven pathogenic types, of which the highest incidence rates of type V and type II are 36.1% and 25%. And the distribution of a wide range of areas for our country, the dominant pathogenic type of R. solani. Tests show that the pathogenicity of the southern ward strains are generally stronger than the northern one; the same region can have different pathogenic strains mixed exist; the same strain in different geographical environment, the pathogenicity will change. Through the identification of disease resistance of 13 natural disease nurseries in 7 provinces, the results obtained are basically the same as those of artificial inoculation. Only under the influence of the natural environmental conditions, the pathogenicity of the bacterial strains is more complicated and more pathogenic types appear. This study for the research of R. solanacearum lines, in-depth peanut identification of resistance to bacterial wilt, to explore new sources of resistance, accelerate the progress of disease-resistant breeding and provide a basis for the design of integrated control measures.