What kills mosquitoes immediately includes several fast-acting methods, both chemical and physical, that provide instant knockdown, though residual protection requires different approach. For immediate kill of mosquitoes in flight or resting, EPA-registered aerosol sprays containing pyrethrins and synthetic pyrethroids like tetramethrin, permethrin, and deltamethrin kill on contact within seconds to minutes, such as Raid Flying Insect Killer or professional space sprays used in foggers, which are effective for indoor use. Electric fly swatters and bug zappers kill immediately on contact with electric grid, providing instant satisfaction. For yard, thermal foggers using pyrethrins create fog that kills mosquitoes instantly on contact in area. For natural immediate kill, soapy water spray made with dish soap like Dawn mixed with water breaks surface tension and suffocates mosquitoes and larvae quickly, and rubbing alcohol spray can kill on contact but not residual. For larvae in standing water, Bacillus thuringiensis israelensis, or Bti, dunks kill larvae within 24 hours. Professional barrier treatments by Mosquito Joe and Mosquito Squad kill adult mosquitoes on contact when they land on treated foliage, but take up to 30 minutes to work after contact. Most effective immediate kill for outdoor gathering is using fan plus aerosol repellent with DEET or picaridin, as fan blows mosquitoes away instantly. No method provides permanent immediate kill forever, as new mosquitoes fly in, so combination needed.
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