Vector Surveillance

Cockroach density and infestation status in urban Rizhao, Shandong Province, China, 2018-2023

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  • 1. Disinfection and Vector Control Institute, Rizhao Center for Disease Control and Prevention, Rizhao, Shandong 276826, China;
    2. Donggang District Center for Disease Control and Prevention of Rizhao City, Rizhao, Shandong 276800, China

Received date: 2023-12-19

  Online published: 2025-05-09

Abstract

Objective To investigate the density, infestation status, distribution characteristics, and seasonal fluctuations of cockroaches in the urban area of Rizhao, Shandong Province, China, so as to provide a basis for the Patriotic Health Campaign and scientific control of cockroaches. Methods Cockroach surveillance data by the sticky trap method were collected at farmers' markets, supermarkets, catering industry areas, hotels, hospitals, and residential areas in the main urban area of Rizhao from 2018 to 2023. Excel 2010 was used to calculate cockroach density and infestation rate. With the use of SPSS 22.0, the relationship between cockroach density and meteorological factors was analyzed through Spearman rank correlation analysis, and the infestation rates of cockroaches in different habitats were compared using the Chi-square test. Results From 2018 to 2023, the captured cockroaches in the urban area of Rizhao City were all Blattella germanica, with an annual average density of 0.016 cockroaches/trapping paper and the average infestation rate was 1.34%, and there was a statistically significant difference in the infestation rate of cockroaches in different habitats (χ2=15.274, P<0.001). The average density and infestation rate of cockroaches in farmer's markets were the highest, at 0.045 cockroaches/paper and 4.38%, respectively; followed by residential areas (0.021 cockroaches/trapping paper and 1.55%, respectively). The seasonal fluctuation in the monthly average density of cockroaches shows a unimodal distribution, reaching its peak activity in July. The monthly average temperature (rs=0.540, P=0.001), the monthly average maximum temperature (rs=0.532, P=0.002), the monthly average minimum temperature (rs=0.552, P=0.001), and the monthly average relative humidity (rs=0.497, P=0.004) were all positively correlated with the monthly density of cockroaches (all P<0.05). Conclusions The density of cockroaches in Rizhao is at a low level. The focus of cockroach control should be placed on B. germanica and in farmers' markets and residential areas, and the strategies should adopt environmental management combined with the use of insecticides.

Cite this article

ZHANG Hai-yan, LI Yan-qing, CHEN Hai-feng, LI Kai, WANG Shu-ling, QIN Xu-ting, WANG Wei-guang, LI Li-li, LI Yan . Cockroach density and infestation status in urban Rizhao, Shandong Province, China, 2018-2023[J]. Chinese Journal of Vector Biology and Control, 2025 , 36(2) : 153 -157 . DOI: 10.11853/j.issn.1003.8280.2025.02.003

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