The three essential oils viz., cinnamon oil, lemongrass oil and eucalyptus oil were used in 2:1:1 ratio. Initially, four different combinations of the three essential oils (1:1:1, 2:1:1, 1:2:1 and 1:1:2) were prepared and evaluated against mosquitoes inthe laboratory using human volunteers (5 replicates) and the opti-mum combination (2:1:1), which provided longer repellency was selected for the patch formulation