Residual Efficacy of Diflubenzuron on Mosquito Larvae around Ankara province in Turkey

The efficacy of diflubenzuron on mixed mosquito larvae ( Culex sp., and Anopheles sp.) and it’s deterioration in clean aquatic system were tested in the certain intervals by the HPLC. It was determined that the diflubenzuron (20 % wettable formula) deteriorated by 30 % at the end of three months and 60 % at six months. Based on this finding,  first 1,9 g (commercial product of 20 % WG) / 0,15 m 2 corresponding to the standard dosage (25 g / h) applied to mixed larvae and caused 100 % mortality in 96 hrs and then the application dosage reduced by 30 percent and then applied again. It was examined that the larvae mortality was observed as 80 % in 96 hours. When the dosage reduced 60 % corresponding six months residual efficacy, no sufficient larvae mortality were observed, and therefore our finding proved that the residual effectiveness of wettable diflubenzuron lasted to 30 days in the clean surface water.