The optimal interval of case dissimilarity threshold R for CBR was determined by a CFW forecast test,and the best mean prediction error rate of the ill plant rate and the ill leaf rate were 7.4% and 9.3% respectively.

• 对CFW进行预测；确定了案例相异阈值R的最优范围；得到病株率、病叶率的最优平均预测误差率分别达7.；4%25、9