炭疽病。又名褐斑病,主要危害兰叶。其症状是叶面出现椭圆形病斑,由小到大,由黄变黑,严重时连片腐烂。大多在梅雨季节发生,在湿度80%以上,高温闷热时发病最盛。当发现时要立即剪除病叶,集中烧毁,清理周围环境卫生,加强通风,随即用多菌灵800倍液或炭疽美600倍液喷射。每10～15d 喷洒 anthrax. Also known as brown spot, the main hazard to blue leaves. The symptoms of oval lesions appear on the leaves, from small to large, from yellow to black, severe contiguous decay. Mostly occur in the rainy season, when the humidity is above 80%, the disease is most vigorous when the hot and hot are hot. When it is found to immediately cut the diseased leaves, concentrated burned, clean up the surrounding sanitation, and enhance ventilation, then use carbendazim 800 times or anthrax 600 times jet. Spray every 10 ~ 15d