clipped from: www.peoplespharmacy.com   
A. Instead of spraying DEET or an insecticide at mosquitoes, try 90 percent isopropyl alcohol, which you should be able to find in almost any pharmacy. Put some in a plastic spray bottle and adjust the nozzle so you get a fine mist. Next time a mosquito comes close or rests on a wall just zap it with the alcohol. This should be safer for you and deadlier for the mosquitoes.

Another great defense from mosquitoes is to use Bti discs in your pond. This is a naturally occurring bacteria that is safe to humans and other animals but is deadly to mosquito larvae. The scientific name is: Bacillus thuringensis israelensis. It can be purchased at hardware stores.