苹果白粉病分布广、发生普遍、危害严重,是我省苹果产区的主要病害之一。该病主要为害苹果的芽、嫩梢、花、叶和果实。新梢被害后停滞生长,并陆续干枯。此外实生苗发病也普遍,严重地影响苹果生产。我们于1984年和1985年,作了苹果白粉病发生调查和防治试验,现整理于后: 一、苹果白粉病发生情况 1.苹果白粉病田间消长情况:通过从4月到 Apple powdery mildew is widely distributed, widespread, serious harm, is one of the major diseases in the apple-producing areas in our province. The disease mainly affects apple buds, tender shoots, flowers, leaves and fruits. After the shoots stagnant growth, and gradually dried up. In addition, the incidence of seedlings is also common, seriously affecting apple production. We in 1984 and 1985, made a survey of apple powdery mildew and prevention and control test, are finishing after: First, the occurrence of apple powdery mildew 1. Apple powdery mildew field growth and decline: by from April to