The invention relates to sterilization composition which comprises active ingredients and
pesticide preparation assistant components, and particularly, the active ingredients comprise
chlorothalonil and
benzothiostrobin at the weight ratio of (0.05-60):1. According to the sterilization composition,
benzothiostrobin and
chlorothalonil are compounded in a proportional range, accordingly, firstly, the sterilization composition has a remarkable synergistic effect and can concurrently treat multiple diseases of crops, the
pesticide application times are reduced, and the cost is saved; secondly, two active ingredients in the sterilization composition are two sterilizing agents with different action mechanisms, the prevention spectrum is enlarged, and the
insecticide resistance is relieved; and thirdly, the synthesis process
route of
chlorothalonil in the composition is mature, the yield is high, and the cost is low, so that on the premise that the
drug efficacy is guaranteed through compounding with
benzothiostrobin, the production cost is reduced, and resources are saved.