马尾松毛虫是我国属尾松最普遍而又最严重的害虫,解放后各地用滴滴涕和666等杀虫药剂大面积防治取得一定的效果。但近年来,某些地方由于长期使用一种药剂,要逐年增大浓度才能收到预期的效果。因此,松毛虫对上述药剂的抗性问题已引起有关方面的注意。敌百虫属有机磷化合物,残效期较短,使用安全,杀虫效果高而快,成本低,副作用比滴滴涕和 Dendrolimus punctatus is the most common and serious pest in Pinus sylvestris. After the liberation, some insecticides, such as DDT and 666, have been widely used in prevention and treatment to a certain extent. However, in recent years, in some places, the long-term use of a pharmaceutical agent requires increasing the concentration year by year to receive the expected results. Therefore, the problem of the resistance of the pine caterpillars to the above medicaments has drawn the attention of the parties concerned. Trichlorfon is an organophosphorus compound with short residual period, safe use, high insecticidal effect and fast, low cost and side effects than DDT and