Derived from the seeds of the neem tree, neem oil has become a popular natural solution to pest control. This oil is said to be effective in repelling certain insects and can reduce their ability to feed and breed. One pest that neem oil is particularly beneficial against is fungus gnats – a solution of neem oil and water can kill this pest on contact and reduce infestation numbers around your property. When using neem oil for fungus gnats, be sure to dilute several drops of neem oil into a spray bottle full of water and a little bit of mild dish soap. Spray the mixture on the tops and undersides of plant leaves and on soil wherever you are dealing with this pest. Also, be sure not to overwater indoor plants as this is a major cause of fungus gnats around your home.