The picture I grew up with of mosquito control is of a slow moving vehicle spraying poison out while children ran along behind and played in the spray. This does not exactly conform to best practices for mosquito control. While pesticides may be necessary at some point for the control of mosquitoes, they should be used in a manner that does not expose people to them if at all possible. However, there are many things you can do to prevent mosquito problems that do not involve pesticides.
Mosquitoes need still water to lay their eggs in and reproduce. Making sure that you have no sources of stagnant water around your house is one of the easiest ways to combat mosquitoes. Tires, empty flower pots, and toys that might hold water should be stored upside down or disposed of.
Some things, though, have to stay. Birdbaths and watering troughs come to mind. Here you have a couple of options. You can use one of the little aerators that keeps the surface of the water rippling to keep the mosquito from laying her eggs. In birdbaths and small water gardens, you can use a mosquito dunk, which is toxic to mosquito larvae and nothing else. Mosquito dunks are considered organic. Or you can use mosquito fish, little guppy size fish that live off mosquito larvae. They go in the water troughs and keep them free of mosquitoes. Some states regulate or ban these little fish, though, so check with your fish and game people before putting them in something.
Mosquitoes are most active at dawn and dusk. If you keep yourself and your animals inside during these times, you reduce the exposure to mosquitoes and mosquito borne diseases. Make sure that horse stalls have good screen over their windows and other open spaces to prevent the mosquitoes from entering. Make sure the screens on your windows and doors are in good repair and do not have holes in them.
Mosquitoes carry some nasty diseases. Eliminating standing water, keeping your pets and yourself in during peak activity times, and making sure mosquitoes cannot come in where you are are some easy ways to protect yourself from them.
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