Efficacy of Pyriproxyfen in Inhibiting the Development of Aedes aegypti Larvae under Field and Laboratory Conditions

Abstract

This study was to experiment under field and laboratory conditions. The Pyriproxyfen 0.01 ppm was tested against the larvae (L3-4) of Aede aegypti in water containers and then follow up to observation the growth development. The emergence inhibition rate were used for index efficacy of Pyriproxyfen. It was found that mean of EI between indoor and outdoor containers which exposed to sunlight in Nongsonghong village, Warinchamrab District, Ubonratchathani Province was slightly increase to 98% and 86.11%, likely in laboratory was to 92.05% and 96.82% respectively. Comparing means average of EI. between field and laboratory was no statistic significant (t= 0.707, df = 1, P-value = 0.608).

The entomology impact in field were adult and larval surveys by periodic 1 time/2 week during 12 weeks. It was found that landing rate in experiment village were slightly little and decrease on every periods of surveys. On the other hand in control village were slightly increase more than in experiment village. There was statistic significant between experimental and control village (t =-4.513, df =5, P-value =0.006). For house index survey in experiment and control villages was slighthly high stable and statistic significant (t =-5.952, df =5, P-value =0.005). The results of this study showed that Pyriproxyfen have efficacy on emerged inhibition to larvae, further more landing rate and house index were appropriate use for evaluation the effective of larval control.