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在田间自然发病的条件下,1989～1990年调查不同地区3个大豆品种大豆灰斑病的普遍率和严重度,证明普遍率和严重度的关系都可用 Gompertz 衍生模型描述,而以普遍率小于65％时拟合最好。3个品种的 I-S 关系可用一个通式描述。
Under the condition of natural disease in the field, the prevalence and severity of soybean gray leaf spot in three soybean cultivars in different regions from 1989 to 1990 were investigated. The relationship between prevalence and severity was proved by the Gompertz derivative model. However, Fitting best at 65%. The three varieties of I-S relationship can be described by a general formula.