杜鹃花肿病又称叶肿病、杜鹃花饼病,是真菌中的一种外担子菌所引起的。感染发病的部位以嫩叶为主,花芽、新梢亦可致病。当病原体侵入植株后,可引起寄主(植株)内的细胞大量分裂,形成许多薄壁组织,使感染部位畸形增生。病变初期,叶正面出现淡白色、半透明、近圆形的病斑,后变成淡白色,叶片部分或全部变成肉质或加厚,产生大 Rhododendron also known as swollen disease, cuckoo diseased, is a fungus in the outside of a basidiomycete caused. Infected parts of the main young leaves, flower buds, shoots can also be pathogenic. When the pathogen invades the plant, can cause a large number of cells within the host (plant) division, the formation of many parenchyma, so that infected parts of abnormal proliferation. Early lesions, pale leaves appear white, translucent, nearly circular lesions, later became pale, some or all of the leaves into succulent or thickened, resulting in large