ABSTRACT
ObjectiveTo analyze the interannual fluctuation， seasonal fluctuation， habitat distribution and the correlation of the 3 monitoring indicators of Aedes albopictus in Yangpu District of Shanghai from 2017 to 2021， and to provide a scientific basis for A. albopictus control and rational use of the indicators. MethodsThe density surveillance data of A. albopictus recorded by Breteau index （BI）， Path index （PI） and the mosquito ovitrap index （MOI） from 2017 to 2021 in Yangpu District， Shanghai were compared. Microsoft Excel 2019 software was used for data summary and SPSS 25.0 software was used for statistical analysis. ResultsFrom 2017 to 2021， there were two months with BI>5， and the PI were all above the density control level of Class C， and there were nine months with MOI≥5. In 2017， BI was higher than in the other four years， with statistically significant differences （all P≤0.001）. MOI in 2017 and 2020 was higher than in 2019 （P=0.029， P=0.004） and 2021 （P=0.005， P=0.001）， with statistical significance. MOI for different types of habitats varied significantly， with a statistically significant difference （P=0.004）. A linear correlation was observed between BI and PI （r=0.462， P=0.010）. ConclusionBI， PI and MOI are used simultaneously to reflect the density of A. albopictus in Yangpu District of Shanghai. However， these three monitoring indicators show poor linear correlation. Comprehensively considering the scientific aspects of monitoring methods and seasonal fluctuations of indicators， it is suggested that MOI should be used as the main index to evaluate the density of A. albopictus. In the MOI， attention should be paid to factors such as the distribution of the habitats， the standardization of operating methods， and quality control， which are essential for enhancing the reliability of the MOI.
ABSTRACT
ObjectiveTo develop a new mosquito trap and evaluate its effectiveness in Aedes albopictus monitoring in an urban community. MethodsThe first-round field test was conducted in a well-greened residential neighborhood with high Aedes albopictus density calculated by human landing catch in August 2022， in Minhang District， Shanghai. 65 new test containers with different designs were randomly deployed in the field. These trap containers were designed by different material， color， hole size， shape and top cover colors. The results of mosquito and its egg trapping were observed and recorded continuously for 7 days. In September 2022， the second round of experiment was conducted. After comparison， an optimized trap container was designed. 140 new trap containers were compared with 140 traditional ones to evaluate the effectiveness. SPSS 22.5 software was used for statistical analysis. ResultsThere were significant changes in the outcome of mosquito and its egg trapping on the 4th and 7th day of the pre-experiment deployment of the three kinds of containers. The 200 ml container cup with three round holes in the body had the best effect on trapping mosquitos and eggs， with a positive rate of 45.5% （5/11）， while other type of contrainer cup only had a positive rate of 12% （6/50） in trapping mosquitos and eggs. Statistical significant differences （χ2=45.443，P <0.001） existed between the two tpyes of cups within the first kind of trapping container. The second kind of trapping container showed round and oval holes had better effect on mosquito trapping， with a positive rate of 55.6% （5/9）. The third kind of hanging container can resist strong wind. The best mosquito trapping effect of three round holes was 66.7% （2/3）. The container wall should not be made of rough material， which was easy to cause the escape of adult mosquitoes. Combined with the three types of containers， the new contariner should be top transparent， and the top 1/3 of the side should paint black with 3 round holes. The effective recovery rate of the new container was higher than that of the traditional one under the exclusion of human factors， and had the advantage of preventing rain， wind and rollover， but the effect of trapping mosquito and its egg was comparable to the traditional one（χ2D4=0.197，P=0.658； χ2D7=0.125 ，P=0.724）. ConclusionThis new type of mosquito trap is worth further exploration and research， which can improve the trapping efficiency， overall recovery rate and the accurate confirmation of the mosquito density.
