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Gnats in the Soil

Gnats present in soil are typically the fungus gnats. They are a sub-species well known for its destructive feeding habits. Because larvae remain within soil and near the bottom of affected plants, fungus gnat infestations are difficult to identify before they have caused considerable damage. 

Although fungus gnats may thrive in a variety of areas containing considerable fungal deposits, these gnats most commonly leave their eggs in rich, damp soil. Gnat larvae feed on the roots, root hairs and stems of plants, causing an overall decline in plant health. 

The extermination of these gnats generally necessitates the removal of all fungal growth in plant soil. If you have an infestation in potted plants, let the soil dry completely between watering periods. Never over-water houseplants. Commercial crops are more difficult to protect from fungus gnats. If the location of infestation can be identified, topsoil should be raked away to expose eggs and larvae to air and sun. After allowing these damp areas to dry out, specialized chemical treatments may be administered with the assistance of a professional.

Fungus Gnats

Fungus Gnat Biology

Fungus Gnat Larvae