１棉铃虫药效的三种计算方法介绍方法一为相对防效计算法，即以对照区残虫量减去药剂处理区残虫量除以对照区残虫量来反映药剂的效果；方法二为校正防效计算法，即以施药前与药后处理区虫口减退率减去对照区虫口减退率，除以１减去对照区虫口减退率；方法三亦为校正防效计... 1 Bollworm efficacy of the three calculation methods introduced a method for the relative effectiveness of the calculation method, that is, the control area of ​​the amount of residuals minus the pesticide treatment area divided by the amount of control area to reflect the effect of pesticides; method two To correct the effectiveness of the calculation method, that is, before and after treatment of pesticide treatment area reduction of the rate of reduction of insect population in the control area, the rate of reduction of the population divided by 1 minus the control area of ​​the population decline rate;