【摘要】 经大量调查研究得到如下结论: 1. 四川小麦白粉病初侵染源有三种情况:一是川西北盆缘完全越夏区, 初侵染源为当地越夏的子囊壳和紧邻高原春麦上的分生孢子及山区自生麦苗上的分生孢子; 二是川南部分越夏区, 小麦白粉病初侵染源,主要来自800m 海拔以上自生麦苗上的分生孢子;三是盆地中部非越夏区,初侵染源完全依赖盆地周缘秋苗上的分生孢子。2. 西北气流、西南气流和西北偏北气流是盆周缘菌源向盆地内扩散的重要途径。3. 四川白粉病流行激增期均在3 月中旬～4 月下旬。更多还原

【Abstract】 This paper studied initial infection of Erysiphe graminis DC.F.SP.Trici EM.Marchal in Sichuan province.The initial infection source included (i)oversumming cleistothecia on the straw and conidia either from spring wheat in close plateau or from volunteer seedlings in the north western parts of Sichuan province;(ii)condia from volunteer seedlings growing over 800m elevator in the southern parts;(iii)condia from autumn seedlings growing in the border of the middle parts of the basin.South western airflow,south northern airflow and bias north air current were important path for condia in the periphery of basin to disperse into the middle parts of Sichuan Basin.The period of great increase of the disease in Sichuan was from March 15 to April 30.更多还原