Objective To investigate the inhibitory effect of pyriproxyfen water emulsion, S-methoprene granules, and S-methoprene microcapsule suspension on the emergence of Culex pipiens quinquefasciatus larvae in water collecting wells of underground garages in buildings, and to provide a scientific basis for the control of mosquito larvae. Methods In 2019, pyriproxyfen water emulsion, S-methoprene granules, and S-methoprene microcapsule suspension were placed in the water collecting wells of underground garages in buildings of a residential area in Guangzhou, China to control Cx. pipiens quinquefasciatus. The spoon method was used to collect the larvae and pupae of Cx. pipiens quinquefasciatus in the water collecting wells on days 3, 7, 14, 21, and 28 after the application of pyriproxyfen water emulsion, S-methoprene granules, and S-methoprene microcapsule suspension, and the larvae and pupae were taken back to the laboratory to observe emergence. Results On day 3 after application, the water collecting wells treated by pyriproxyfen water emulsion, S-methoprene granules, and S-methoprene microcapsule suspension had a significantly lower emergence rate of Cx. pipiens quinquefasciatus larvae than the control water collecting wells (pyriproxyfen water emulsion:χ2=176.414, P<0.001; S-methoprene granules:χ2=13.268, P<0.001; S-methoprene microcapsule suspension:χ2=34.784, P<0.001). On days 3-28 after application, the water collecting wells treated by pyriproxyfen water emulsion had a significantly lower emergence rate of Cx. pipiens quinquefasciatus larvae than the control water collecting wells (P<0.001). On days 3-21 after application, the water collecting wells treated by S-methoprene granules had a significantly lower emergence rate of Cx. pipiens quinquefasciatus larvae than the control water collecting wells (P<0.001). On days 3-14 after application, the water collecting wells treated by S-methoprene microcapsule suspension had a significantly lower emergence rate of Cx. pipiens quinquefasciatus larvae than the control water collecting wells (P<0.001). Conclusion Pyriproxyfen water emulsion, S-methoprene granules, and S-methoprene microcapsule suspension can reduce the emergence rate of Cx. pipiens quinquefasciatus larvae in water collecting wells of buildings, among which pyriproxyfen water emulsion has relatively long half-life and control effect duration, while S-methoprene has short half-life and control effect duration, but it is suitable for use in places with high environmental protection requirements.
LIU Jie, LI Xiao-ning, JIANG Yi-min, LIANG Xue-ying, CHEN Zong-qiu, HE Zheng, GAN Lu, HU Lai-gui, LUO Lei
. Inhibitory effect of pyriproxyfen versus S-methoprene on the emergence of Culex pipiens quinquefasciatus in water collecting wells of underground garages in buildings[J]. Chinese Journal of Vector Biology and Control, 2020
, 31(6)
: 702
-705
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DOI: 10.11853/j.issn.1003.8280.2020.06.016
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