Investigation of mosquito larval habitats and insecticide resistance in an area with a high incidence of mosquito-borne diseases in Jining, Shandong Province

Abstract

BackgroundTo investigate mosquito larval habitats and resistance to common insecticides in areas with high incidence rates of mosquito-borne diseases in Jining, Shandong Province, and to provide a scientific basis for the future prevention and control of mosquito-borne diseases and the rational use of insecticides. Methods and resultsFrom June to September 2018, mosquito habitat characteristics and species compositions in Jintun town were studied through a cross-sectional survey. Larvae and pupae were collected in different habitats using the standard dipping technique. A total of 7,815 mosquitoes, comprising 7 species from 4 genera, were collected. Among them, Culex pipiens pallens (n = 5,336, 68.28%) was the local dominant species and found in all four habitats (rice paddies, irrigation channels, water containers, drainage ditches). There were 1,708 Cx. tritaeniorhynchus (21.85%), 399 Anopheles sinensis (5.11%), 213 Armigeres subalbatus (2.72%), 124 Aedes albopictus (1.59%), and 35 other (Cx. bitaeniorhynchus and Cx. halifaxii) (0.45%) mosquito samples collected. Spearman correlation analysis was employed to evaluate the relationship between larval density and the physicochemical characteristics of the breeding habitat. It was found that the larval density of Cx. tritaeniorhynchus correlated positively with water depth (r = 0.927 p = 0.003), the larval density of An. sinensis correlated positively with dissolved oxygen (DO) (r = 0.775 p = 0.041) and the larval density of Cx. p. pallens correlated positively with ammonia nitrogen (r = 0.527 p = 0.002). Resistance bioassays were carried out on the dominant populations of Cx. p. pallens: mosquitoes presented very high resistance to cypermethrin and deltamethrin, moderate PLOS ONE PLOS ONE | https://doi.org/10.

The Larval Density of Mosquitos (Diptera: Culicidae) in Jiaxiang County, Shandong Province, China: Influence of Bacterial Diversity, Richness, and Physicochemical Factors

“…From the results of the regression equation, it is evident that AN and WD had the highest density contribution to Cx. tritaeniorhynchus, which is the same as the research results of Wang et al, (Wang et al, 2020). Cx.…”

“…All these conditions are suitable for breeding a variety of mosquitoes. Culex pipiens pallens and Aedes albopictus are the dominant mosquito species (Wang et al, 2020). The former is a potential vector of the West Nile virus (WNV) in Shandong Province (Jiang et al, 2014).…”

“…However, Jiaxiang County is rich in water resources, is densely populated, and its residents have a weak awareness of prevention, applying unreasonable mosquito control methods, and inadequate sanitation management. Hence, it is difficult to manage the larval breeding sites in this area (Wang et al, 2020). The Breteau Index (BI), an indicator of the density of Aedes mosquitoes in an area, can be used to assess the risk of dengue epidemics in that area.…”

“…Also, over the last decade, the resistance of Cx. p. pallens to different types of insecticides has risen to varying degrees (Liu et al, 2019;Wang et al, 2020). Therefore, scientific guidance is urgently needed to carry out LSM in this county.…”

Spatial heterogeneity and temporal dynamics of mosquito population density and community structure in Hainan Island, China

“…Previous studies in Guangzhou and other places showed that urban areas had a higher proportion of container type habitats, whereas more agricultural related habitats are found in the rural area. These two habitat types support the breeding of different mosquito species [ 37 , 41 ], which may in part explain the difference in species composition in these areas. However, there is no detailed habitat availability evidence from Hainan Island, so further studies are needed.…”