关键词: 密度监测, 越冬蚊虫, 防治

Abstract:

Objective The species, quantity and distribution of the wintering mosquitoes in Dongcheng district were investigated to provide data basis for early forecast, prediction and handling of emergency events. Methods The wintering mosquitoes were monitored by visual observation. Five observation places were randomly selected from the monitoring sites,1m² for each, to record the number of mosquitoes within 5 min. In the process, priority was given to the monitoring in the major habitats for overwintering mosquitoes such as air-raid shelters, basements and greenhouses. Results Wintering mosquitoes had been observed for two consecutive years, and were identified as Culex pipiens pallens in both years. In 2008, a total of 31 monitoring sites were set up, covering a cumulative monitoring area of 5600 m², resulting in a positive rate of 19.35%. In 2009, 26 monitoring sites were set up with the cumulative area of 2835 m², resulting in a positive rate of 15.38%. The number of winter mosquitoes significantly increased in 2009 as compared to that in 2008, the average mosquito density being 0.88 per m² in the former and 0.41 per m² in the latter. The number of wintering mosquitoes in air-raid shelters remained high for the two consecutive years with the average mosquito density of 3.50 and 6.25 per m², respectively. Conclusion Air-raid shelters were the major habitat for wintering mosquitoes. The monitoring of mosquito and the prevention and control of related infectious diseases in the next summer should be strengthened.

Key words: Density monitoring, Wintering mosquitoes, Prevention and control