月季的病害很多,其中以黑斑病发生最重,叶片、嫩枝、花梗都可受害。病斑通常出现在叶片表面,直径1.5～1.3毫米的圆斑,边缘纤毛状,黑色和深褐色,常常有黄色晕圈包围,手持扩大镜可见病斑上黑色疱状的小颗粒。病斑成为带有绿色边缘的小岛。病叶容易脱落,但有些月季品种直到病斑大 There are many diseases of roses, of which the occurrence of black spot is the heaviest, leaves, shoots, pedicels can be affected. Lesions usually appear on the surface of leaves, with circular discs of 1.5-1.3 mm in diameter, ciliate edges, black and dark brown, often surrounded by a yellow halo, and hand-held magnifying mirrors with small black blisters on the lesion. Lesions become islands with green edges. Sick leaves easily fall off, but some rose varieties until the lesion