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本文选用敏感性不同的几个田间品系，采用点滴法和浸渍法， 室内测定了丙溴磷和辛硫磷１：１、１：２、１：３、１：４、１：５ 和１：６ 混合的增效程度及其与抗药性的关系。结果表明：（１） 所有配比都具有一定的增效作用；随着辛硫磷的比例增大，共毒系数的变化呈抛物线状，以中间比例（１：４ 和１：５） 的共毒系数为最高。（２） 丙溴磷和辛硫磷１：１ 混配时江苏六合品系（对丙溴磷和辛硫磷耐药性分别达３．５ 倍和２．７ 倍）的共毒系数比敏感品系高，达到２７７．６。同样，山东聊城品系（ 辛硫磷１１ 倍，丙溴磷３．８ 倍）的共毒系数平均值达１８４．４，也明显高于新疆阿拉尔敏感品系。
In this paper, several field lines with different sensitivities were selected. With the drip method and immersion method, the contents of profenofos and phoxim 1: 1, 1: 2, 1: 3, 1: 4, 1: 5 and 1: 6 synergism and its relationship with drug resistance. The results showed that: (1) All the ratios had certain synergistic effect. With the increase of the phoxim proportion, the change of co-toxicity coefficient showed a parabolic curve with a middle ratio (1: 4 and 1: 5) The poison coefficient is the highest. (2) Compared with susceptible strains of Jiangsu Liuhe strain (resistance to profenofos and phoxim up to 3.5 and 2.7 times, respectively) when mixed with 1: 1 of profenofos and phoxim High, reaching 277.6. Similarly, the average co-toxicity coefficient of Shandong Liaocheng strain (11 times of phoxim and 3.8 times of profenofos) reached 184.4, which was also significantly higher than that of Xinjiang Alar sensitive strains.