Objective To investigate the effect of Breteau index (BI) versus mosquito ovitrap index (MOI) in the continuous surveillance of Aedes albopictus larva density, as well as the difference in density surveillance methods between different types of residential area. Methods From April to December in 2020, Ae. albopictus density was monitored once in the first, middle, and last ten days of each month by the BI and MOI methods in different habitats of Huzhou, Zhejiang province, China. SPSS 19.0 software was used to perform the t-test and a one-way analysis of variance to investigate the difference in density index between different surveillance methods and months.The repeated measure analysis of variance was used to compare BI and MOI between different methods and types of residential area. Results Both BI and MOI methods showed that the density of Ae. albopictus larvae increased first and then decreased over time from April to December. Comparison of BI and MOI from August to November based on the t-test showed that BI was higher than MOI in November (t=2.672, P=0.012). Pairwise comparison of BI from August to November showed that BI in August and in September was statistically higher than that in October and in November (P<0.05), and pairwise comparison of MOI showed that MOI in August, September, and October was statistically higher than that in November (P<0.05). The repeated measure analysis of variance showed a statistical difference between months (F=17.222, P<0.001) from August to November; there was no statistical difference between different methods (F=0.001, P=0.999), while there was a statistical difference between different types of residential area (F=8.096, P=0.008). The repeated measure analysis of variance for BI from August to November showed a statistical difference between months (F=12.144, P=0.002); there was no interaction between type of residential area and month (F=2.645, P=0.095), but there was a statistical difference in BI between different types of residential area (F=11.744, P=0.004). The repeated measure analysis of variance for MOI from August to November showed a statistical difference between months (F=8.062, P=0.001); there was no interaction between type of residential area and month (F=1.063, P=0.375), and there was no statistical difference in MOI between different types of residential area (F=0.197, P=0.664). Conclusion The density of Ae. albopictus larvae monitored by BI and MOI is consistent in most cases, but BI and MOI can replace each other only when internal environment is relatively consistent. MOI is better than BI in case of great changes in environmental conditions.
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