通过对攀枝花市凤凰木根病的野外调查，室内保湿培养、分离培养、镜检等研究，结果表明：攀枝花市凤凰木的致命病害为白纹羽病；其病原为子囊菌亚门的褐座坚壳菌（Ｒｏｓｅｌｉｎｉａｎｅｃａｔｒｉｘ），自然条件下难见其有性和无性孢子，菌丝体及菌索常见；菌索白色，羽纹状分布于根表面，菌核少见．对轻病株环状根施、枝干喷药、加强养护管理可取得较好的防治效果． The results showed that the deadly disease of Fenghuangwu in Panzhihua City was white-striped feather disease, and the pathogen was the brown sessile Mycoplasma (Roselinianecatrix), its natural conditions are difficult to see their sexual and asexual spores, mycelium and mycelium common; fungus white, feather-like distribution in the root surface, rare sclerotia. Cyclophthora root rot disease, branch spray, strengthen conservation management can get better control effect.