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Bug zappers attract and kill thousands of insects, but most of them aren’t mosquitoes. They kill only a small number of mosquitoes in the area. (Ironically, they zap a lot of insects that prey on mosquitoes.)
Propane Gas Traps
Placing propane gas traps in your yard will effectively capture many mosquitoes, but again, only a small fraction of those in your yard.
Ultrasonic devices have no repellency value at all, according to studies.