Comparative study of the formulas for calculating of outbreak control multi\|cycle plant disease
多循环植物病害病情控制效果计算公式的比较

In this study,after comparing of three formulas that they are Abbott formula,Henderson-Tilton formula and Yang xindong formula for calculating of outbreak control multi-cycle plant disease,there is the result:Yang xindong formula is the optimization.In Abbott formula,the more the radio of the initial epidemic situation in treatment and control is,the greater error is;The smaller the values of the initial epidemic situation in treatment and control are,the greater error is.The greater the values of final epi...