通过室内生物活性测定和田间防治试验,灭幼脲Ⅰ号对美国白蛾卵死亡率与浓度的关系符合Logistic模型,杀卵效果随日龄延长而下降。施药后2～6天开始大量死亡,浓度在10ppm以上杀虫效果达100％,且具有较长的残效期。若与低浓度敌百虫混用,可加速幼虫死亡,并增效10％左右。 Through indoor bioassay and field control test, the relationship between the concentration of diflubenzuron I on the mortality and the concentration of white moth eggs in the United States conformed to Logistic model, and the ovicidal effect decreased with the increase of the age. A large number of deaths occurred 2 to 6 days after spraying, and the insecticidal effect was 100% at a concentration above 10 ppm, and had a longer residual period. If mixed with low concentrations of trichlorfon, can accelerate larval death, and synergism of about 10%.