苹果白粉病是一种常见的果树病害,在我区苹果产区均有发生,个别地区和果园发生较重。春季温暖干旱有利于病害前期发病;夏季多雨凉爽及秋季晴朗利于后期流行。一、危害症状苹果白粉病主要危害实生嫩苗,大树芽、梢、嫩叶,也危害 Apple powdery mildew is a common disease of fruit trees in apple-growing areas in my area have occurred in some areas and orchards heavier. Warm and dry spring is conducive to the early disease disease; summer rainy and cool autumn and sunny conducive to the late epidemic. First, the harm symptoms Apple powdery mildew is the main hazard of live seedlings, tree buds, shoots, young leaves, but also endanger