2.5 percent Permethrin (spelling) in Mosquito-B-Gon (not the Malathion version that smells) and "Yard Guard" works pretty well. Plan to respray about every two weeks, or after the second rain.
Bug zappers use ultraviolet light to attract bugs. For me, they have worked best 50 feet away from the patio.
Zeta-Cypermethrin is labeled to work a long time, but I'm not impressed.