Libby from Dickinson, Al writes
Fungus gnats get in my plants that I start in peat pots or pop-up pellets.
A diatomaceous earth product such as Manna Pro Pure Defense would not be recommended for fungus gnats. Fungus gnats are usually found due to over-watering, so we would recommend to first be sure to allow plants to properly drain and dry up some to eliminate the breeding environment. You can use a systemic insecticide such as Bonide Systemic Granules incorporated into the soil of containerized plants. You can also apply a residual insecticide spray such as Talstar P over the top of the soil of infested plants.
Answer last updated on: 03/24/2017