玉米在生长中后期,由于温度、湿度条件很适宜玉米大斑病和小斑病的发生。这一时期要特别注意调查玉米的中下部叶片,如果发现病斑要及时进行药剂防治,以免造成减产。玉米的大斑病和小斑病病原菌不同,为害的部位基本相同,防治的方法和用药相同。玉米大斑病的病原菌为大斑突脐蠕孢菌,主要为害玉米的叶片,严重发生时可为害叶鞘和苞叶。发病初期在叶片上形成水渍状斑点,逐渐沿叶脉扩 Corn in the growth of the late, due to temperature and humidity conditions are suitable for the occurrence of spotted leaves and small spot of corn. During this period, special attention should be paid to the investigation of middle and lower leaves of corn. If it is found that lesion spots should be treated in time, pesticides should be avoided to reduce production. Big spot disease of corn and small spot disease pathogenic bacteria are different, the same damage to the site, the same prevention and treatment methods and medication. The pathogen of maize leaf spot is Epinephelus maculata, the main damage to corn leaves, leaf sheaths and husk leaves can be harmful in severe cases. The early stages of the formation of water-like spots on the leaves, gradually expanding along the veins