红三叶白粉病田间分布型的研究  

STUDY ON FIELD DISTRIBUTION PATTERN OF RED CLOVER POWDERY MILDEW

作　　者：袁庆华[1] 蒋文兰[2] 

机构地区：[1]甘肃农业大学草原系,兰州730070 [2]甘肃草原生态研究所

出　　处：《草业科学》1990年第6期55-57,共3页Pratacultural Science

摘　　要：本文用平均拥挤度(M~*)和平均数(x)的回归测定法研究了红三叶白粉病(Erysiphe polygoni DC.)病枝与病级在田间的分布型。结果表明,红三叶白粉病枝和病级分布的基本成分是聚集的,有明显的发病中心。而集团内的分布则是均匀的。The methods of linear regtession eguation mean Crowding(m~*)on mean number of infected branches(X)were used to study the field distribution patterm of red clover branches infected by powdery mildew(Erysiphe polygoni)and that of their infectiosity classes,in this paper.The tesults show that the field distribution patterns of both infected branthes and their infectiosity classes were aggregative ones,with obvious infecting centre,while there was a regular distribution in intra-colony,instead.

关 键 词：红三叶草 白粉病 田间分布型 

分 类 号：S435.4[农业科学—农业昆虫与害虫防治]