关键词: 蚊虫, 三带喙库蚊, 季节消长, 流行性乙型脑炎

Abstract:

Objective To identify the distribution patterns and seasonal variation of mosquitoes in rural areas of Guiyang city, providing the basis for the control and prevention of mosquitoes and Japanese encephalitis(JE). Methods Mosquito suction tubes were used in residential areas, pigpens and cattle sheds, while human-baited net traps were used outdoors to capture mosquitoes from August to September in routine survey spots and from April to November in monitoring spots. Every 3 months, these traps were set up to collect mosquitoes for 15 min at the same location. Results Three genera and 7 species of mosquitoes were collected at suburb survey spots of Guiyang city. The composition of Culex tritaeniorhynchus and Armigeres subalbatus accounted for 54.84％ and 33.13％, respectively. From April to November, 10 863 female mosquitoes were collected at monitoring spots, of which Ar. subalbatus accounted for 74.46%, Anopheles sinensis 20.90%, Cx. tritaeniorhynchus 3.00%, and Cx. pipiens quinguefasciatus 1.27%. The density of mosquitoes varied with different habitats, and the highest reached 221.33 mosquitoes/labor-hour in cattle sheds. Mosquito activities began late April, with gradual increase of density in May and peaked in late June and early July. Maintaining high levels from August to September, the density dropped rapidly since October. Seasonal variation was significant among different mosquito species. Conclusion Cx. tritaeniorhynchus was the dominant species with peaking density from August to September, which coincided with the epidemic of JE. Hence, Cx. tritaeniorhynchus may be the main vector of this disease in the region, while other species may be contributive to the viral transmission.

Key words: Mosquito, Culex tritaeniorhynchus, Seasonal variation, Japanese encephalitis