Abstract: Objective To investigate the species composition of the flies and seasonal fluctuation in Liaoning province and to provide a scientific basis for controlling the breeding and control of flies. Methods The cage trap method was used to capture flies from April to October during 2013-2017. The monitoring sites were chosen in the residential areas, restaurants, greenbelts and farm produce markets in fourteen cities of Liaoning province. Then the composition ratio of flies was analyzed, and the density differences of different species and different environments and their seasonal fluctuations were compared. Results A total of 3 000 cages, 123 855 flies and the density of 6.88 per cage per hour from 2013 to 2017, annual fly density was 7.19, 9.23, 6.42, 5.72, and 6.03 per cage per hour in 2013, 2014, 2015, 2016, and 2017 respectively. Lucilia sericata (45.12%), Musca domestica (14.80%) and Muscina stabulans (13.89%) were the predominant species. The highest density of flies was found in farm produce markets (9.96 per cage per hour) and the lowest was found in the residential areas (4.22 per cage per hour). The overall seasonal prevalence in last five years was a single-peak curve. The peak density of flies in each year appeared in middle July or middle August. Conclusion The control system of flies in Liaoning province should be coordinated with the seasons. In July and August when flies are most active, control measures should be adopted, which mainly focus on environmental management and supplemented by pesticide applications to effectively reduce the density of flies.

Key words: Flies, Density, Species composition, Seasonal fluctuation

摘要： 目的 了解辽宁省蝇种构成及其季节消长等变化规律，为控制蝇类孳生繁殖及制定蝇类防制方案提供科学依据。方法 2013－2017年每年的4－10月在辽宁省14个市选择居民区、餐饮外环境、绿化带（公园）、露天农贸市场4类适合蝇类孳生或活动场所作为监测点，采用诱蝇笼法进行蝇密度监测，分析蝇种构成比，比较不同种类、不同生境蝇密度及其季节消长规律。结果 共布放诱蝇笼3 000个，捕蝇123 855只，总蝇密度为6.88只/（笼·h），各年度蝇密度依次分别为7.19、9.23、6.42、5.72和6.03只/（笼·h），其中丝光绿蝇、家蝇和厩腐蝇为优势种，分别占捕获总数的45.12%、14.80%和13.89%。不同生境蝇密度以露天农贸市场最高，达9.96只/（笼·h），居民区最低，为4.22只/（笼·h）。蝇类季节消长呈单峰型曲线，各年度蝇密度高峰在7月或8月中旬。结论 辽宁省蝇类防制应与季节相结合，在蝇类最活跃的7、8月采取以环境治理为主、药物杀灭为辅的防灭蝇措施，从而有效降低蝇密度。

关键词: 蝇类, 密度, 种群构成, 季节消长