月季黑斑病是月季花的一种主要病害,此病主要侵染叶片,也为害嫩技、花梗及叶柄等部位,发病初期叶面出现褐色小斑,以后病斑日渐扩大为圆形或近圆形,直径为4～12毫米,紫褐色或黑褐色,并有放射状纹,得病部位坏死,上生黑 Rose black spot disease is a major disease of rose flowers, the disease mainly infects the leaves, but also damage to tender technology, pedicel and petiole and other parts of the early onset of brown patches, the lesion gradually expanded to a circle or near Round, 4 to 12 mm in diameter, purple-brown or dark brown, and radial pattern, diseased parts necrosis, black on the students