The correlation equation for the concentration-mortality curve of a specific pesticide and a control pesticide was used to adapt the effectiveness data from residual activity tests to the corresponding chemical application concentration, to calculate the constant with the decreasing speed equation, and to calculate the application dose necessary to maintain an equal residual effect period by the same equation. The calculated value is the amount of pesticide needed to perform with the same efficiency as the control pesticide (effectiveness and period of effectiveness), which is vitally important to effectively select an appropriate pesticide.