Chemical sprays can kill mosquitoes in the landscape, but the best way to get rid of them does not involve pesticides. It is to eliminate their breeding grounds, according to the University of Kentucky. Mosquitoes breed in standing water, and it takes just a few days for hundreds of new mosquitoes to produce. Get that under control, and you are well on your way in ridding your outdoor space of these pesky pests.
Examine your landscape for standing water, such as empty flower pots, junk piles and old tires. Remove these items. Clean gutters one or two times a year, and tighten up covers on cars and boats so they do not sag and fill with water after it rains.
Fill low-lying areas with soil or mulch so water does not accumulate. Remove grass clippings and yard debris from drainage ditches so the water can continue moving. Also, overturn wheelbarrows, small boats, buckets and other items where water can gather.
Change birdbath water weekly. Maintain chlorine or salt-water pools to prevent mosquitoes from breeding. Use aerating pumps in fish ponds and other water features to keep the water moving, not standing. You can also stock fish ponds with mosquito-eating fish, such as mosquitofish (Gambusia affinis).