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苍蝇可传播多种疾病,如痢疾、伤寒等,也可干扰人们的正常工作和休息,蝇密度的高低,反映一个城市卫生状况的好坏。应用化学杀虫剂杀灭苍蝇,控制其密度,具有快速、方便的优点,是防制蝇类的主要措施之一。虽然杀虫剂的用量越来越大,施药范围越来越广,但灭蝇效果逐年下降。2003—20
Flies can spread a variety of diseases, such as diarrhea, typhoid, etc., but also interfere with people’s normal work and rest, the density of flies, reflecting the health of a city is good or bad. The application of chemical insecticides to kill flies and control its density has the advantages of being quick and convenient and is one of the main measures for preventing flies. Although the amount of insecticide is more and more widely applied, the effect of killing flies is decreasing year by year. 2003-20