ENGLISHInitial symptoms are narrow, dark brown leaf spots that enlarge over time into oblong to irregularly shaped lesions with dark tan centers and dark brown to purple margins (Plate 9).

• 症状/发病信号: 最初的症状是在叶片上出现窄的，棕黑色的斑点，随着时间的推移扩大成椭圆形至无规则切口，中心呈棕褐色 而边缘为暗褐色或紫色（见图9）。