苹果早期落叶病是一种常见的病害,一般年份有零星发生,多雨年份发病严重。如防治不及时可造成早期落叶,对树势,产量及当年的花芽形成影响很大。我场1973、1974和1977年曾3次大发生。1973年仅部分地段的元帅、金冠和红玉等感病品种发病较重,而1977年落叶病则普遍发生,造成大面积落叶。为了总结经验教训,我们对落叶病进行了调查,结果如下: Apple early deciduous disease is a common disease, sporadic occurrences in general years, severe onset of rainy years. If the control is not timely can cause early deciduous, tree vigor, yield and flower bud formation of the year. My field 1973,1974 and 1977 have occurred three times. In 1973, only some sections of the Marshal, Golden Delicious and ruby ​​and other susceptible varieties heavier incidence, and in 1977 the deciduous disease is widespread, resulting in a large area of ​​deciduous. In order to summarize the lessons learned, we conducted a survey of deciduous diseases and the results are as follows: