Objective To investigate the fly density and its seasonal fluctuation in Dongcheng district of Beijing, China, and to provide a reference for fly control. Methods From 2014 to 2019, fly density was monitored by the cage trapping method at seven surveillance sites in Dongcheng district from April to October. The surveillance data were statistically analyzed by Excel 2007 software. Results From 2014 to 2019, the dominant fly species in Dongcheng district were Sarcophagidae (35.16%), Muscina stabulans (18.92%), Musca domestica (16.83%), and Lucilia sericata (13.19%), accounting for 84.10% of the total fly counts. The overall fly density decreased from 2014 to 2019. The fly density peaked in July. In terms of different habitats, greenbelt had the highest fly density (6.20 flies/cage), followed by hotels (5.49 flies/cage) and residential areas (4.88 flies/cage). The dominant fly species in greenbelt and residential areas were Sarcophagidae and M. domestica, respectively. Conclusion This study reveals the fly density, species composition, and seasonal fluctuation in Dongcheng district. Fly control should focus on greenbelt and hotels. The fly density peaks in July, suggesting that fly control measures should be taken before the peak.
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