●●● 杀虫剂防效计 ●● ● ●●0 ●● Calculation of adjusted mortality (Xy)/x*100 X: percent survival in the untreated controls e Y: percent survival in the treated insect o The approximation is permissible when the control mortality is less than 20% or is based on a large number or observation⚫ Calculation of adjusted mortality: ⚫ (x-y)/x*100 ⚫ X: percent survival in the untreated controls ⚫ Y: percent survival in the treated insect. ⚫ The approximation is permissible when the control mortality is less than 20% or is based on a large number or observation