炭疽病大叶黄杨炭疽病发生在叶片和嫩梢上。叶片上的病斑呈椭圆形或圆形,病斑边缘有较狭的深褐色隆起,中央灰白色,后期在灰白色处形成较粗的圆形或椭圆形小黑点,排列稀疏,多在叶片正面,有时呈轮纹状排列。在嫩梢上,病 Anthrax lobster anthracnose occurs on leaves and young shoots. Lesions on the leaves were oval or round, lesser dark brown uplift on the edge of the lesion, central gray-white, later in the off-white formation of thicker round or oval black spots, arranged in sparse, mostly in the front of the blade , Sometimes arranged in a pattern of wheels. On young shoots, sick