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应用模糊聚类分析的理论和方法，对小麦纹枯病的发生流行动态进行预报，选取分辨力较高的聚类指标，截取λ＝ ０－８ 可分４ 类，结果与实况对照，证明模糊聚类划分的流行年型与经验分型完全一致。
Applying the theory and method of fuzzy clustering analysis, we forecast the epidemic dynamics of wheat sheath blight, select the clustering index with high resolution, and intercept λ = 0-8, we can classify it into 4 categories. The popular year classification of cluster classification is exactly the same with the experience classification.