白粉病又称霜霉病或白霉病,它的病源是子囊菌纲白粉菌目白粉菌属。白粉病主要危害月季、瓜叶菊等花卉的新梢嫩叶。发病初期,嫩叶新梢顶端的表面出现白粉状小点,以后变成白色粉斑,叶面如覆盖一层白粉,后变为灰色。叶片受害,停止生长,并卷曲皱缩,逐步向上下蔓延,遍及新枝花柄和花蕾各部,使月季长不成良好的枝叶。白粉病在我国华南地区发病比较早,自春节后阴雨天开始发生,一直到五月底。此病多发生于生长在潮湿不通风、光照不足环境下的植株。六月后气温较高及秋、冬季气候干 Powdery mildew, also known as downy mildew or white mold disease, its source is Ascomycete powdery mildew fungus genus. Powdery mildew mainly endangered rose, cineraria and other flower shoots tender leaves. Early onset, the tip of young shoots appear white powdery spots on the surface, later became white spots, leaves covered with a layer of white powder, then turned gray. Leaves damage, stop growing, and curly shriveled, and gradually spread up and down, throughout the new branches and flower bud buds ministries, so that the rose is not a good long branches and leaves. Powdery mildew in southern China incidence of earlier, since the beginning of the rainy day after the Spring Festival, until the end of May. The disease occurs in plants growing in moist, non-ventilated, under-lit environment. High temperatures in June and autumn and winter dry climate