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玉米大、小叶斑病是为害秋玉米的重要病害。据我社1972年调查,秋玉米小叶斑病株发病率达100％,叶发病率也在97％以上,大叶斑病叶发病率也在30％以上,合计发病指数在40～50之间,严重的达88.14。“两病”损失率估计在20～30％左右,严重的达50％以上。这是当前影响我社秋玉米产量的主要障碍。为摸索玉米大、小叶斑病的发生发展规律及其防治途径,我们于1972年10月中下旬组织部分大队、生产队植保员对玉米叶斑病发生和防治情况作了调查,现将结果简报于下:
Corn, small leaf spot is an important disease of autumn corn. According to our survey in 1972, the incidence of autumn corn leaf spot blight reached 100%, the incidence of leaf was above 97%, the incidence of leaf blight was above 30%, and the total incidence index was between 40 and 50 , Serious up to 88.14. “Two disease” loss rate is estimated at about 20 to 30%, severe up to 50%. This is the main obstacle to our current autumn corn production. In order to explore the occurrence and development of large and small leaf spot maize and its prevention and treatment, we organized some brigades in late-middle-October 1972. Plant protection team members made a survey on the occurrence and control of corn leaf spot disease. Under: