Gnats, like mosquitoes, feed on blood from a host. They are very small, usually 2 millimeters at the largest, and attack in swarms. They are more of a nuisance than any real threat, because they are so small and their bite is so unobtrusive that it will often go unnoticed.

The only truly effective way to prevent gnats is to treat, with residual pesticides, the soil in which they lay their eggs. This will cause the emerging gnats to die. However, as gnats have a life span of only about 7 days, it is necessary to apply the pesticide almost weekly. Another method is to use brightly colored sticky tape of boards. The gnats will be attracted to them, get stuck, and die.

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