关键词: 雨水井, 1%双硫磷, 蚊虫, 居民区, 诱蚊诱卵器指数

Abstract:

Objective To explore the risk factors of mosquito-borne diseases and to evaluate the effect of 1% temophos granule on the mosquitoes, so as to provide information for mosquito control operations. Methods The survey used a random sampling of eight residential areas, setting up the experimental and the control group in July-September in 2017 in Qibao town, Minhang district, Shanghai. After putting 1% temophos granule(Abate) into the rain wells, we investigated the positive rate of mosquito larvae, monitored the density of adult mosquito by CO₂ mosquito trap, and calculated the mosq-ovitrap index utilizing Mosq-ovitrap. The Excel 2007 software was used to establish the databas. The SPSS 21.0 software was used for statistical analysis. Counting data were expressed as percentages, and Chi square test and Rank sum test were used for correlation analysis. Statistical significant difference was decided at P<0.05. Results A total of 1 200 rainwater wells were investigated. The positive rate of mosquitoes between experimental group(74/592, 12.50%) and untreated control group(138/608, 22.70%) of rainwater wells had statistically significant differences(χ²=21.443, P=0.000). The positive rate of mosquito between experimental group(21/161, 13.04%) and control group(68/166, 40.96%) of grate type rainwater wells had statistical significance (χ²=32.163, P=0.000). Yet, the positive rate of mosquitoes between experimental group (53/431, 12.30%) and control group (70/442, 15.84%) of inspection wells had no statistical significance (χ²=2.259, P=0.133). In total, 1 696 adult mosquitoes were captured by CO₂ mosquito traps. The experimental group(average density 0.58 mosquitos/hour) and control group(average density 2.36 mosquitos/hour) had statistical significance(Z=4.460, P=0.000). The test showed that the density of Culex pipiens pallens(Z=4.374, P=0.000) and the density of Aedes albopictus(Z=4.459, P=0.000) were statistically significant by rank sum test, and there was no significant difference in Cx. tritaeniorhynchus(Z=1.000, P=0.317). A total of 900 mosquito ovitraps were deployed, with 825 retrieved and 299 positives. The Mosq-ovitrap index(MOI) had statistically significant(χ²=61.285, P=0.000) between experimental and untreated control groups in Ae. albopictus, MOI in the experimental group was approximately half of the control group. Conclusion The density of larval and adult mosquitoes could be effectively reduced through dosing 1% temephos granule into rainwater wells especially grate type in residential areas. The control effect is particularly obvious to Ae. albopictus.

Key words: Rainwater wells, 1% parathion, Mosquito, Residential area, Mosq-ovitrap index