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玉米是我国仅次于水稻、小麦的重要粮食作物。在过去,玉米相继大面积发生过大斑病、小斑病,给玉米生产造成了一定的损失。近来年,我国一些玉米产区又发生一种异于小斑病和圆斑病的叶斑病。据调查,当前玉米制种利用的主要自交系如黄早四、掖107、E28、M017、丹340等以及它们的杂交种都受到不同程度的危害,制种田受害严重的地块减产达50％,甚至绝产。1994年,北京郊区夏玉米总面积243万亩,其中发生这种叶斑病的面积约181万亩,占总面积的74％,受害严重的品
Corn is an important grain crop next to rice and wheat in China. In the past, large spot blight and spot blotch occurred on large areas of maize, causing some losses to corn production. In recent years, some maize producing areas in our country have occurred another leaf spot that is different from the spot blotch and round blotch. According to the survey, the current main inbred lines used for seed production such as Huangzao 4, Ye 107, E28, M017, Dan 340, and their hybrids have been harmed to varying degrees. The production of severely damaged plots has reduced production by 50 %, Or even abortion. In 1994, the total area of summer maize in Beijing suburbs was 2.43 million mu, of which about 181 million mu were affected by this leaf spot disease, accounting for 74% of the total area.