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本文通过对玉米粗缩病２５６个病株样本分析，依据株粒重损失，采取偏等差分级法，制订了严重度５级分级标准，经株粒数、株粒重、株高、雌穗长等项数量指标验证，符合玉米粗缩病发生规律。实际应用时，依据株粒数结合株高进行严重度分级，既不失真，又简便易行。运用苗期病株率与病情指数的关系（Ｙ＝－１．６１５９＋１．０３０６Ｘ），进行发生程度和产量损失预测，对于指导大田防治更有实际的意义。为进一步开展玉米粗缩病的调查研究提供了资料。
Based on the analysis of 256 diseased samples of maize disease, based on the loss of grain weight, partial grading method was adopted to establish the grading scale of 5 grades of severity. The grading criteria of grain weight, plant weight, plant height, Long number of items such as verification, in line with the occurrence of corn rough law. Practical application, according to the number of strains combined with plant height grading, neither distortion, but also simple and easy. The use of the relationship between the disease rate and seedling disease rate (Y = -1.6159 + 1.0306X), the degree of occurrence and yield loss prediction, for the guidance of field control more practical significance. It provided the data for further research on the research of maize rough.