玉米大斑病(Helmin Thosporium Turcium)是玉米主要叶部病害之一。世界各国玉米种植区均有发生和危害。1942年美国由于推广了感病玉米杂交种造成大斑病流行。近些年来我国许多省区,玉米大斑病也广泛流行,成为玉米重要病害之一。国内外研究和实践证明,改良玉米遗传结构,实行抗病育种是防治玉米大斑病的经济有效措施。六 Helmin Thosporium Turcium is one of the main leaf diseases in maize. Occurred and endangered corn growing areas in various countries in the world. In 1942, the United States caused a large leaf spot epidemic due to the promotion of susceptible maize hybrids. In recent years, many provinces and autonomous regions in China, maize leaf spot is also widely prevalent, as one of the important diseases of corn. Domestic and foreign research and practice have proved that improving maize genetic structure and implementing disease-resistant breeding is a cost-effective measure to prevent and cure maize leaf spot. six