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本文根据两个总体的Ｆｉｓｈｅｒ判别准则，对山东省惠民县１９６７～１９７７年共１１年二代棉铃虫发生程度的两类资料进行了数量分析，建立了判别方程：ｙ＝０．０１２７ｘ１－０．０２３１ｘ２，对历史资料与独立样本进行了回代验证与预测，拟合率在９０％以上
Based on two general Fisher discriminant criteria, two kinds of data were analyzed on the degree of occurrence of the second generation cotton bollworm in Huimin County of Shandong Province from 1967 to 1977, and the discriminant equation was established: y = 0.0127x1-0 .0231x2, the historical data and independent samples were verified and predicted back to the fitting rate of 90% or more