Fungus Gnats Plant. Typically, fungus gnats eat algae, decaying matter, and fungi. While fungus gnats are a pest, they don’t necessarily damage the leaves or the plant itself.
You can identify fungus gnats by their black or brown colour with translucent wings. 6 ways to get rid of fungus gnats in houseplants for good use a hydrogen peroxide & water solution. Fungus gnats do have wings, however, they only fly around the soil or nearby the plant.