Objective To investigate water accumulation and mosquito larvae breeding in rainwater wells in residential areas at mosquito density peaks as well as the effectiveness of 5% pyriproxyfen and fenthion granules in controlling the mosquitoes, and to provide a basis for the control of mosquito larvae in rainwater wells in the residential areas. Methods From August to September, 2019, 64 rainwater wells in the south and 58 rainwater wells in the north of a residential area in Qingpu, Shanghai, China were selected as experimental group and control group, respectively. The experimental group was given 5% pyriproxyfen and fenthion granules; water accumulation and mosquito larvae breeding in the rainwater wells were investigated before insecticide application and 1, 3, 7, 14, 21, and 28 days after insecticide application (7 investigations in total). Results Thirty-five (28.69%) rainwater wells had water accumulation during all the 7 consecutive investigations of 122 rainwater wells in the residential area, 12 (9.83%) rainwater wells had water accumulation during 1-6 of the 7 investigations, and 75 (61.48%) rainwater wells had no water accumulation during all the 7 investigations; the water accumulation rate of the rainwater wells were 30.33%-36.89% (χ2=1.176, P=0.278), and there was no significant correlation between water accumulation rate and precipitation 3 days before investigation (r=0.558, P=0.193). The positive rate of mosquito larvae breeding in the rainwater wells in the experimental group decreased to 16.67% 1 day after insecticide application, showing a significant difference compared to the positive rate (62.50%) before insecticide application (χ2=4.689, P=0.027); the concurrent positive rate of mosquito larvae breeding in the control group was 41.18%-55.56%, showing no significant difference (χ2=0.252, P=0.769); the positive rate of mosquito larvae breeding in the rainwater wells in the experimental group was 0 14 days after insecticide application; 23.81% 21 days and 38.46% 28 days after insecticide application, there were no significant difference compared to the control groups (all P>0.05). Conclusion From August to September, the water accumulation in the rainwater wells in the residential area in Qingpu is stable; 5% pyriproxyfen and fenthion granules can control the mosquitoes in the rainwater wells for about 2 weeks; therefore, it is recommended to regularly apply insecticides in long-term water accumulation to scientifically control mosquito larvae breeding in the rainwater wells.
REN Zhi-hua, LIU Tian, CHEN Jia-xin, WANG Yu-feng, CHEN Zi-yi, ZHOU Yi-bin
. A study of effectiveness of 5% pyriproxyfen and fenthion granules in controlling mosquito larvae in rainwater wells in residential areas[J]. Chinese Journal of Vector Biology and Control, 2021
, 32(3)
: 374
-377
.
DOI: 10.11853/j.issn.1003.8280.2021.03.023
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