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Fungus gnats are small, dark, short-lived fliesthe larvae of which feed on plant roots and fungi.
Fungus gnats are typically harmless to healthy plants but can inflict extensive damage to seedling. Their presence can also indicate more serious problems, particularly overwatering; they may be feeding on roots that have sat in drain water too long and are thus rotting, or the gnats may be attracted to fungus growing in saturated topsoil. Consequently, allowing the soil to dry may reduce their numbers.
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