Abstract: Objective To study the efficacy of the mixed gas (10% ethylene oxide and 90% carbon dioxide) in pest control. Methods Poisoning of the target pests was achieved by direct inhalation of the gas and the poisoning time and the death process of the pests were observed, with simulated field test and container on-site verification implemented. Results Fumigation with sulfuryl fluoride at a concentration of 100 g/m³ killed the 3 kinds of harmful pests in the laboratory with KT₅₀ within 71 min, and KT₅₀ was within 163 min at a concentration of 50 g/m³. In the laboratory and simulated field trials,the kill rate of target pests was 100% at a given concentration and duration, which was in line with the results in the laboratory. The 24 hour mortality rate of the test target pests in the laboratory and field reached 100%. Conclusion There is a relationship between the dose and the duration of action in terms of the efficacy of the mixed gas (10% ethylene oxide and 90% carbon dioxide) in killing the target pests, providing a scientific basis for setting the correct dosage and time of container fumigation.

Key words: Ethylene oxide, Culex pipiens quinquefasciatus, Musca domestica, Blattella germanica, Rats, Killing effect

摘要： 目的 了解10%环氧乙烷和90%二氧化碳混合气体对有害生物的杀灭效果。方法 采用直接吸入染毒法,观察试靶动物中毒时间及死亡情况,并经过模拟现场试验与集装箱现场验证。结果 该混合气体施药剂量为100 g/m³时,对实验室内害虫的KT₅₀均在71 min内,当施药剂量为50 g/m³时,KT₅₀均在163 min内。在模拟现场和集装箱现场试验中,每种试靶动物在预定的施药剂量和熏蒸作用时间击杀率均达100%,与实验室结果相符。实验室及现场试靶动物24 h死亡率均达100%。结论 阐明了10%环氧乙烷和90%二氧化碳混合气体杀灭靶标昆虫在不同剂量及作用时间的关系,为今后集装箱熏蒸工作中设定正确的投药量及时间提供了科学依据。

关键词: 环氧乙烷, 致倦库蚊, 家蝇, 德国小蠊, 大白鼠, 杀灭效果