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Adult fungus gnats are little black flies about 1/8 inch in length, and larvae or maggots have a shiny black head and elongated, whitish to transparent body with 1/4 inch in length.
Adults are mostly appearing whenever you water your plants, and their presence is considered a nuisance. Adult fungus gnats do not damage plants but their larvae feed on roots, stunting plant growth and causing foliage to yellow and wilt.
Fungus gnats develop through four stages- egg, larva, pupa, and adult. Adults live about one week, during which time each female deposits 100 to 150 eggs. They are laid near the stems of plants, and they hatch within 4 days. The larvae feed for about two weeks and then pupate. After 3 to 7 days in the pupal stage, adults emerge.
You can get rid of Fungus Gnat infestations using beneficial nematodes for fungus gnats with the natural pest control products below: