Answer: What you describe sound like fungus gnats. These tiny little critters feed and breed in moist, decaying organic matter such as potting soil. There are several ways to control the pests. Since they breed in moist potting soil, you can break the breeding cycle by allowing the surface of the soil to dry out. If you have plants that need moist soil simply place a quick draining and fast drying layer of gravel or sand on top of the potting soil, or temporarily cover the potting soil with plastic wrap. Any of these will provide a barrier between the pests and the potting soil. You have to be a little patient with this method because you have to wait through the next generation's maturation before they are gone for good. In other words, once the generation now already in the soil become adults and die off without being able to reproduce, there should be no more gnats. Another method is to use a product called Gnatrol as a soil drench, another is to use an insecticidal soap as a soil drench. Of course, always follow the label instructions carefully. I hope this helps!
Q&A Library Searching Tips