关键词: 吡丙醚, 白纹伊蚊, 致死率, 化蛹率, 羽化率

Abstract:

Objective To evaluate the effectiveness of 0.5% pyriproxyfen granules for control of Aedes albopictus, providing the basis for mosquito control drugs and techniques during the Shanghai World Expo. Methods Larvae immersion was conducted to determine the mortality, pupation and eclosion rates at different concentrations under laboratory conditions and simulated field conditions. The control effects at 0.06 and 0.08 mg/L on different larval instars were assessed. Pyriproxyfen was applied on-site to the breeding sites of Ae. albopictus (water wells and other water bodies) in residential areas, and the mosquito density was measured using the mosquito biting method. The larvae-containing water bodies were collected from the experiment field for further observation of larval growth and development. Results (1)At the concentration gradient from 0.06 to 0.12 mg/L, the mortality of larvae was 25.75%-49.00% and the pupation rate 31.19%-40.25% under laboratory conditions; adult mosquitoes did not emerge. The pupation rate of the control group was 99.25%, and the eclosion rate was 95.47%;(2)the tested agent inhibited the pupation and eclosion of multiple larval instars at 0.06 and 0.08 mg/L, and the eclosion rate decreased as the concentration rose; (3) under the simulated environment, pyriproxyfen effectively inhibited the pupation and eclosion of mosquitoes at a concentration of above 0.5 mg/L in the shade; and(4)the density of both larval and adult mosquitoes reduced sharply at the breeding sites after on-site application of pyriproxyfen granules, according to the investigation of breeding sites and adult mosquito biting method. Only 0.24%-0.71% of the larvae collected from the water bodies developed into adults. Conclusion Pyriproxyfen can inhibit the growth and development of Ae. albopictus larvae. 1 mg/L of pyriproxyfen can be directly applied to the breeding sites for mosquito control.

Key words: Pyriproxyfen, Aedes albopictus, Mortality, Pupation rate, Eclosion rate