吡丙醚、S–烯虫酯对楼宇地下车库集水井致倦库蚊幼蚊羽化抑制效果比较研究

Inhibitory effect of pyriproxyfen versus S-methoprene on the emergence of Culex pipiens quinquefasciatus in water collecting wells of underground garages in buildings

目的比较研究吡丙醚水乳剂、S-烯虫酯颗粒剂、S-烯虫酯微胶囊悬浮剂3种昆虫生长调节剂对楼宇地下车库集水井致倦库蚊幼蚊羽化抑制效果,为幼蚊控制提供科学选用依据。方法 2019年在广州市某小区楼宇地下车库集水井投放吡丙醚水乳剂、S-烯虫酯颗粒剂和S-烯虫酯微胶囊悬浮剂控制致倦库蚊,用勺舀法在投药后第3、7、14、21和28天分别采集集水井中幼蚊、蛹带回实验室观察羽化情况。结果投药后第3天经吡丙醚水乳剂、S-烯虫酯颗粒剂和S-烯虫酯微胶囊悬浮剂处理集水井中致倦库蚊幼蚊羽化率均明显低于对照集水井中致倦库蚊幼蚊羽化率(吡丙醚水乳剂:χ^2=176.414,P<0.001;S-烯虫酯颗粒剂:χ^2=13.268,P<0.001;S-烯虫酯微胶囊悬浮剂:χ^2=34.784,P<0.001),吡丙醚水乳剂处理的集水井中致倦库蚊幼蚊羽化率从投药后第3~28天均明显低于对照组(P<0.001);S-烯虫酯颗粒剂处理的集水井中致倦库蚊幼蚊羽化率从投药后第3~21天均明显低于对照组(P<0.001);S-烯虫酯微胶囊悬浮剂处理的集水井中致倦库蚊幼蚊羽化率从投药后第3~14天均明显低于对照组(P<0.001)。结论吡丙醚水乳剂、S-烯虫酯颗粒剂、S-烯虫酯微胶囊悬浮剂均能很好地降低楼宇集水井中致倦库蚊幼蚊的羽化率。其中吡丙醚水乳剂因半衰期相对较长,控制效果持续时间较长;而烯虫酯半衰期短,控制效果持续时间较短,但适合在环保要求较高场所使用。

Objective To investigate the inhibitory effect of pyriproxyfen water emulsion, S-methoprene granules, and Smethoprene 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, Smethoprene 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: χ^2=176.414, P<0.001;Smethoprene granules: χ^2=13.268, P<0.001;S-methoprene microcapsule suspension: χ^2=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, Smethoprene 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.