苹果白粉病在我省凉山、阿坝、甘孜三州发生普遍,受害严重时,影响果树新梢生长,削弱树势,降低产量和品质,是苹果的主要病害之一。当前在苹果大面积生产上对苹果白粉病的防治主要是采用剪除病梢,开花前喷布石硫合剂和在病害盛发期喷布托布津等方法,但仍不能有效地控制其危害。为此,我们 Apple powdery mildew in the province of Liangshan, Aba, Ganzi tributary of the common occurrence of serious damage, affecting the growth of fruit shoots, weaken the tree potential, reduce yield and quality, is one of the major diseases apple. At present, the prevention and control of apple powdery mildew in large-scale production of apple is mainly based on the methods of cutting off the shoots, spraying the lime-sulfur mixture before flowering and spraying Topaz in the flourishing period of the disease, but it can not control the harm effectively. For this, we