用点滴法测定氯氰菊酯与马拉硫磷（１∶６，有效成分）混剂对稻纵卷叶螟三龄幼虫的毒力，结果表明，这一混剂对稻纵卷叶螟有增效作用，共毒系数为１６７．７６。田间药效试验，３０％氯马混剂４０毫升／亩对稻纵卷叶螟的防效显著优于目前常用的杀虫剂 The toxicity of the mixture of cypermethrin and malathion (1: 6, active ingredient) on the third instar larvae of C. medinalis was determined by the drip method. The results showed that the mixture had a synergistic effect on C. medinalis , A total toxic coefficient of 167.76. Field efficacy test, 30% chlorine mixture of 40 ml / mu on the rice leaf roller significantly better control than the currently used insecticides