Control mosquitoes — Get rid of all standing water.

• Turn over or remove containers in your yard where water collects, such as old tires, potted plant trays, buckets, toys, etc.
• Clean out birdbaths and wading pools at least once a week.
• Remove standing water on tarps or flat roofs.
• Clean clogged rain gutters and downspouts.
• Clean and stock garden ponds with mosquito-eating fish or mosquito dunks.
• Recycle old bottles and cans.
• Repair leaky faucets and sprinklers.
• Keep swimming pools clean or drain them.
• Repair door and window screens if torn.
• Keep weeds and tall grass cut short; adult mosquitoes look for these shady places to rest during the hot daylight hours.
• Get rid of mosquito breeding sites. (Electric “bug zappers” do not help since they usually attract more mosquitoes than they kill.)
• Keep window screens on campers, tents, and boats “bug-tight”.

via Utah Department of Health (2004)