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本文通过比色法研究了防虫磷（97％以上）对百蠹（RRhiyzoperthaDominicaFabricus）成虫及杂拟谷盗（Triboliucon-fusumDuval）幼虫体内乙酰碱酯酶（ACHE）的抑制效应。结果表明：依赖于足够的抑制剂的浓度，ACHE被抑制率与抑制剂浓度成正相关，并且符合一级反应的动力学特征，即：lgp=2It，从而获得了Ki及PI_50~[1],间接地反映出抑制剂的作用程度，可见，利用测定酶的活力，来监测害虫的抗药性，是快速可行的方法，特别是该法对有机磷杀虫剂抑制害虫体内AchE活力程度的测定更有实际意义。
In this paper, we studied the inhibitory effect of pendimethalin (97%) on acetylcholinesterase (ACHE) in adult RRhiyzopertha Dominicabricus and Triboliucon-fusum Duval larvae by colorimetry. The results showed that depending on the concentration of sufficient inhibitor, the inhibitory rate of ACHE was positively correlated with the inhibitor concentration and was consistent with the kinetic characteristics of the first order reaction, ie, lgp = 2It. Ki and PI50 ~ [1] Indirectly reflect the degree of inhibitor, we can see that the use of enzyme activity, to monitor the resistance of pests is a fast and feasible method, especially the method of organophosphate insecticides to inhibit pest in vivo AchE activity level more Have real meaning