. The inhibitory activity of diflubenzuron, a chitin synthesis inhibitor, on the ecdysis of
Aedes sp. larvae was evaluated in earthen jars and automobile tires. Two formulations of
diflubenzuron were used in this study: Dimilin® WP (wettable powder), 25% and Dimilin® GR
(granular), 2%. The equivalent rate of 25 g/ha, 50 g/ha and 100 g/ha active ingredients for both WP
and GR formulations were used in this study. Generally, at the higher dosage of 100 g/ha, both
formulations were more effective against Aedes mosquitoes. On the whole, the WP formulation
appeared to perform better than the GR formulation in terms of residual activity.