Surveillance result of cockroaches and insecticide resistance of Blattella germanica in Hefei from 2019 to 2023
Objective To investigate the population composition,annual change and insecticide resistance of cockroaches in Hefei City from 2019 to 2023,so as to provide scientific basis for cockroach control.Methods The cockroach density was monitored in 6 habitats in odd months of each year by sticky trapping method.Descriptive methods were used to analyze the population composition of cockroaches,and the Friedman test was used to compare the temporal variation of cockroaches in different habitats.The resistant population of cockroach was determined by diagnostic dose method.Results From 2019 to 2023,a total of 6 597 effective sticky cockroach sheets were recovered and 758 cockroaches were captured.The dominant species was Blattella germanica.The population composition of cockroach in different years had statistical difference.The average density was 0.115 cockroaches per piece.The cockroach densities from 2019 to 2023 were 0.048,0.118,0.189,0.089 and 0.142 cockroaches per piece,respectively.Among the six habitats,the density of cockroaches in the farmers'market was the highest(0.261 cockroaches per piece),and the density of cockroaches in the hospital was the lowest(0.005 cockroaches per piece).The density of cockroaches showed a bimodal curve,with peak periods in March and September.There were statistical significance in the interannual fluctuation of cockroach density in different habitats(F=13.757,P＜0.05),and statistical significance in seasonal fluctuation of cockroach density in different habitats(F=30.721,P＜0.05).Blattella germanica in Hefei was resistant to cypermethrin and sensitive to imidacloprid,fipronil and propoxur.Conclusion The capture rate and density of cockroaches in Hefei City are low.It is suggested that targeted control should be carried out according to the seasonal fluctuation of cockroach density and insecticide resistance in Hefei City.
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