白粉病是一种世界性的植物病害,大部分花木均会感染此病,主要危害月季、紫薇、黄栌、石楠、卫矛、大叶黄杨、玫瑰、一品红、芍药、秋海棠、栀子、八仙花、九里香等多种园林苗木和园林植物,尤以冬季大棚花卉发病更严重,轻则植株生长不良,丧失经济和观赏价值,重则导致全株死亡。症状特点。白粉病种类很多,但各种白粉病在症状、危害、发病流行方式和防治方法等方面,有着许多相似之处。该病主要侵染植物的叶片、叶柄、嫩 Powdery mildew is a worldwide plant disease, most of the flowers and trees will be infected with the disease, the main endanger the rose, crape myrtle, yellow emperor, heather, ewer, Euonymus japonicus, rose, poinsettia, peony, begonia, gardenia, , Jiuli incense and other garden seedlings and garden plants, especially in winter shedding flowers more serious, ranging from poor plant growth, loss of economic and ornamental value, weight is the cause of death of the whole plant. Symptoms and symptoms. There are many kinds of powdery mildew, but there are many similarities in various powdery mildew in terms of symptoms, harms, prevalence and prevention methods. The disease is mainly infected plant leaves, petioles, tender