Objective To compare the effectiveness of the labor-hour method and the light trap method to mosquitoes, providing the basis for development of scientific and standard mosquito monitoring. Methods The study was conducted in Ningbo, where adult mosquitoes were monitored using the light trap method on a monthly basis to identify the composition and seasonal dynamics of mosquitoes. The resulting data were compared with the monitoring results from 2006 through 2008 based on the labor hour method. Results According to the labor-hour monitoring results, Culex pipiens pallens was the predominant indoor species in the residential areas of the city from 2006 to 2008, accounting for 99.17% of total mosquitoes. Aedes albopictus, Anopheles sinensis and Cx. tritaeniorhynchus accounted for 0.49%, 0.20% and 0.13%, respectively. The light trap monitoring in residential areas showed that Cx. pipiens pallens accounted for 81.55% of the total number, while Cx. tritaeniorhynchus, An. sinensis and Ae. albopictus accounted for 13.43%, 2.31% and 1.97%, respectively. Conclusion Both kinds of approaches were useful in revealing the composition of predominant mosquito species in the region. Therefore, the light trap method, featuring ease of use and minimum man-made factors, is more suitable for long-term systematic monitoring.

【Abstract】 Objective To know the species composition and seasonal change of pest flies in the farm produce trade markets, the external environment of restaurants, the public green belts and the residential areas in Ningbo city, and to provide the theoretical basis for the establishment of flies control strategy. Methods The adult flies were termly captured by cage with attractants and were identified and counted, and then calculating its density and constituent ratio.  Results The dominant species in four kinds of habitats were Musca domestica,  Chrysomyia megacephala  and  Lucilia cuprina,  but  M.domestica, C.megacephala and L.sericata in the farm produce trade markets, C.megacephala, M.domestica and L.sericata in the external environment   of   restaurants,   C.megacephala,   L.cuprina    and   M.domestica   in   the   public  green  belts,  and  M.domestica, C.megacephala and L.cuprina in the residential areas． Among flies captured, the appearance of M.domestica was the earliest, and its disappearance was the latest. However, the activity period of other flies was all less than 8 months each year, and the peak was usually from May to October.  Conclusion In the  control  of  flies,  the  life  habit  and  the  occurrence  rule  of M.domestica, Chrysomyia megacephala, L.sericata, and L.cuprina should be taken into account, and the key control period was from May to October.

Objective To investigate the epidemic situation of encephalitis B and vector mosquitoes, and to provide information for its prevention and control. Methods Collecting and analyze epidemic data. Using light trap, scooping larvae to investigate the density of mosquito. Results In 2006, 42 cases of encephalitis B had been diagnosed, 6 of them died. The density index of mosquito of the patient home and other different locations were 6.05 and 13.22 pieces per light per hour, respectively; Culex( Cx.) tritaeniorhychus were 71.44% and 76.01% respectively. At 26 investigated breeding fields surrounding, respectively the larva density index(LDI) was 12.04 individuals per scoop, while Culex pipiens pallens were 49.44%, Cx.tritaeniorhychus were 37.87% of the total number the larva positive rates of container and crock amassing rain were 54.31% and 30.22% respectively. Aedes albopictus were 66.67% and 49.66% respectively; Cx.tritaeniorhychus were 25.11% and 33.42% respectively; Cx.pipiens pallens were 8.22% and 13.62% respectively. Conclusion The main vector of encephalitis B, Cx.tritaeniorhychus is popular in Ningbo. More attention should be paid to accination and mosquito control in encephalitis B control in Ningbo.