Spatiotemporal variation of <i>Aedes albopictus</i> density treated by hedgerow spraying

ZHU Wei, LIU Xiang-yu, ZHOU Yi-bin

doi:10.11853/j.issn.1003.8280.2021.06.022

Chinese Journal of Vector Biology and Control >

2021 , Vol. 32 >Issue 6: 772 - 778

DOI: https://doi.org/10.11853/j.issn.1003.8280.2021.06.022

Control Experiment

Spatiotemporal variation of Aedes albopictus density treated by hedgerow spraying

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1. Department of Infection and Vector Control, Shanghai Xuhui District Center for Disease Control and Prevention, Shanghai 200237, China;
2. Division of Infectious Diseases Control and Prevention, Shanghai Municipal Center for Disease Control and Prevention, Shanghai 200336, China

Received date: 2021-02-18

Online published: 2021-12-15

Supported by

Supported by the Medical Research Project of Shanghai Xuhui District (No. SHXH201944) and the Scientific Research Project of Shanghai Municipal Health Commission (No. 201940350)

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Abstract

Objective To investigate the spatiotemporal effect of hedgerow spraying technique on the control of Aedes albopictus, and to provide a basis for formulating mosquito control strategies. Methods A science and education park and a residential area were selected from the central area of Shanghai as contrast area and control area,respectively. Hedgerow spraying was performed once a week for two consecutive weeks from July to September in 2020, and the density of Ae. albopictus was monitored once a week for nine consecutive weeks before and after spraying. Relative population index (RPI) was calculated to analyze the change in mosquito density in the experimental area. ArcGIS 10.8 software was used for spatial analysis; the global Moran's I index was used to perform the global spatial autocorrelation analysis; the kernel density method was used to estimate the spatial distribution of egg number; the standard deviation ellipse was used to analyze the location of surveillance sites and the spatial distribution direction of mean egg number. Results After the second time of hedgerow spraying, mosquito ovitrap index decreased from 72.22 to 16.67 and the RPI was 25.23 in the control area, and there was a change in the standard deviation ellipse of mosquito distribution in the contrast area. The global spatial autocorrelation peak radius (maximum Z value) of mean egg number distribution in a single surveillance site was 45 m, with a Moran's I index of 0.192 and a Z value of 5.848 (P<0.001), i.e., the spatial autocorrelation of mean egg number reached the maximum at the radius of 45 m. Conclusion After spraying once a week for two consecutive weeks, hedgerow spraying technique can effectively control Ae. albopictus. In order to avoid the influence of Ae. albopictus in the surrounding area, control measures should be implemented in the buffer area at least 45 m outside the experimental area to improve control efficiency.

Key words： Aedes albopictus; Hedgerow spraying technique; Mosquito ovitrap; Relative population index; Spatial distribution

Cite this article

ZHU Wei, LIU Xiang-yu, ZHOU Yi-bin . Spatiotemporal variation of Aedes albopictus density treated by hedgerow spraying[J]. Chinese Journal of Vector Biology and Control, 2021 , 32(6) : 772 -778 . DOI: 10.11853/j.issn.1003.8280.2021.06.022

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