关键词: 蝇密度, 监测, 种群构成, 季节消长

Abstract: Objective To investigate the density and species composition of flies in Zhejiang province, China since the implementation of new vector surveillance program, as well as the trend of density fluctuation and distribution characteristics of flies in 2016-2019, and to provide a scientific basis for targeted control of flies in Zhejiang province. Methods Based on the geographical features of Zhejiang province and the ecological habit of flies, 10-12 surveillance sites were set up within the province, and the cage trapping method was used for surveillance in April to November each year. Excel 2010 software was used to perform a statistical analysis of surveillance data. Results A total of 4 588 cages were placed from 2016 to 2019, and 13 210 flies were captured in total, with a mean annual density of 2.88 flies/cage; the annual density of flies in 2016-2019 was 4.38, 2.25, 2.03, and 2.29 flies/cage, respectively. In 2016-2019, Musca domestica was the dominant species and accounted for 23.01%, and there was a slight difference in the composition of dominant fly species across these years. Activities of flies showed a long time span from April to November in Zhejiang province, and the trend of seasonal variation showed a single peak, which started to rise in April and decrease after September, while there was a slight difference in the peak time of fly density across the years. There was a slight difference in the peak month of activities between species, mainly in summer, and M. domestica had a long peak time of activity (from May to October). As for different habitats, the highest density of flies was observed in farmers’ market (3.89 flies/cage), followed by restaurants (2.77 flies/cage), and the density of flies in different habitats varied slightly across the years, while the highest density was still observed in farmers’ market. The lowest density of flies was observed in residential areas in 2016-2017, while the lowest density of flies was observed in green belt in 2018-2019. Conclusion Farmers’ market is the main place of the activities of flies, and the peak time of activity is observed in summer. For the prevention and control of flies, targeted measures should be adopted based on the environments and seasons of the activities of flies, so as to effectively reduce the density of flies.

Key words: Fly, Surveillance, Species composition, Seasonal variation