Evaluation of effective period of a juvenile hormone mimic, pyriproxyfen, against Aedes albopictus : Preliminary experiments in the laboratory and the field.

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Effective period of pyriproxyfen against Aedes albopictus was evaluated in the laboratory and the field. Experimental containers were treated with 3 different concentrations of pyriproxyfen and placed in the laboratory. In the field, the experimental containers were placed for 3 weeks, and then treated with the same concentrations as the laboratory experiment. Pupae were collected and the emergence of adults was examined every 2 weeks for 8 weeks. Pyriproxyfen was more effective in the laboratory than in the field. The change of water amount was one of the important factors determining the efficiency of pyriproxyfen in the field. No significant differences were observed in the number of collected pupae among concentrations in the laboratory, while smaller number of pupae were collected from the higher concentrations in the field. The duration for the complete inhibition of adult emergence at the highest concentration (0.1 ppm) was 4 and 6 weeks in the field and in the laboratory, respectively.
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