烤烟病害防治赤星病主要在叶片成熟期发生，特别是打顶后更易感病。主要发病部位是叶片，最初出现针头大的黄褐色圆斑，后变成红褐色。病斑有明显的同心轮纹，周围有淡黄色晕环。潮湿时中央有黑霉，严重时病斑连成片，病部枯焦脱落。主要防治药剂有多抗霉素。每毫升２００... Flue-cured tobacco disease prevention and treatment of brown spot disease occurs mainly in the leaves mature, especially after the top is more susceptible to disease. The main site of disease is the leaves, the first needle large yellowish brown spot, after turning into a red-brown. Lesions have obvious concentric rims, surrounded by yellowish halo. Humid central black mold, severe lesions even into pieces, the disease Kujiao off. The main control agent how antimycin. 200 per ml ...