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从我国江苏、河南、山东、陕西、北京和吉林６个省（市）的不同杨树上收集了４２个杨生褐盘二孢菌（Ｍａｒｓｏｎｉｎａｂｒｕｎｎｅａ）标本，比较和分析了它们的分生孢子大小和形态、培养性状、致病性方面的差异；并观察了它们之间的菌丝融合情况。４２个菌株间的分生孢子平均长度、平均宽度和分隔位置存在差异不显著。菌株个体内单个分生孢子变异幅度很大。分离自白杨派杨树上的菌株孢子萌发时均产生一个芽管；在ＰＤＡ培养基上菌落生长速度较快（２５ｄ菌落直径在１ｃｍ以上），菌落颜色为深褐色，并产生酱红色的孢子堆。来自黑杨派和青杨派上的菌株，孢子萌发时产生多个芽管；在ＰＤＡ培养基上菌落生长速度较慢（２５ｄ菌落直径不超过１ｃｍ），颜色较浅，产生黄绿色孢子堆。人工接种测定各个菌株对不同杨树的致病力，发现来自白杨派的５个菌株对毛白杨有较强的致病力，但对青杨派和黑杨派树种几乎不致病或致病力很弱。来自黑杨派和青杨派树种的３７个菌株，对黑杨派树种Ｉ－４５杨和加杨有较强的致病力；对青杨派树种青杨和小叶杨，对白杨派的毛白杨具有中等程度的致病力。聚类分析表明，来自白杨派的５个菌株为一个类群，来自黑杨派和青杨派的３７个菌株为另一类群。菌株的致病性和菌株的地区来?
A total of 42 samples of Marsoninabrunnea collected from different poplars in 6 provinces (cities) of Jiangsu, Henan, Shandong, Shaanxi, Beijing and Jilin of our country were compared and analyzed for their conidial size And morphology, culture traits, pathogenicity differences; and observed the hypha fusion between them. There was no significant difference in average length, average width and separation position of conidia among the 42 isolates. Individual strains of individual conidia vary widely. The spores germinated from Populus tomentosa had a germ tube when germinated. On the PDA medium, the colonies grew faster (25d colonies more than 1 cm in diameter), the colonies were dark brown in color and the red spore pile . Bacterial strains from Populus and Populus tomentosa produced spores germinating multiple germ tubes. On PDA medium colonies grew more slowly (less than 1 cm in diameter at 25 days) and were lighter in color and produced a yellow-green spore heap. Artificial inoculation to determine the pathogenicity of different strains of different strains of poplar, and found that five strains from Populus tomentosa has strong virulence, but on the Green Poplar and black Poplar tree species hardly pathogenic or pathogenic Weak force. 37 strains of Populus tomentosa from the genus Populus and the genus Populus to I-45 Yang and Jia Yang has a stronger virulence; Poplar has a moderate degree of virulence. Cluster analysis showed that the five strains from Populus were a taxa, and the other 37 strains from Populus tomentosa and Populus davidiana were another group. The pathogenicity of strains and strains of the area come?