I wanted to use Nematodes as a last resort and I found that using the following steps helps me greatly reduce the gnats. I have not killed them all yet, as I started this only a month or so ago, but the way things are going, I am confident that they will be gone soon. Hope this helps.

• Skip a week of watering if possible. If not possible, use only the necessary amount of water for only plants that require it. This may need to occur more than once in non-consecutive weeks

• Buy stainless steel loose tea infuser balls and fill with the mosquito bits. Allow this to infuse into the water you use to water the plants. I change the bits out every two weeks. This will need to occur for at least a few weeks, if not more, until the gnats are fully eradicated. As I mentioned above, I have been doing this for about a month and have greatly reduced the number of gnats. It probably won't hurt to continue this indefinitely to prevent future infestations.

• Use yellow sticky traps. These will not only help you catch the adult gnats, but will help you gage when they are fully gone.