小麦白粉病是我县小麦生产上的主要病害之一,常年发生危害较重。据研究,我地小麦白粉病的初次侵染源,主要来自海拔800米以上地区自生麦苗上越夏的分生孢子。这些分生孢子由西向东,由南向北,由高到低逐级传播。我地小麦种植带由北向南,海拔为230—1500米,呈立体种植。据我站1979—1991年这13年的观测:在一般年 Wheat powdery mildew is one of the major diseases of wheat production in our county, perennial hazards. According to the research, the primary infection source of wheat powdery mildew in China mainly comes from the conidia on the summer wheat from the self-grown wheat seedlings above 800 meters above sea level. These conidia from west to east, from south to north, from high to low level by level. My wheat planting belt from north to south, 230-1500 meters above sea level, was three-dimensional planting. According to my 13-year observation from 1979-1991: in normal years