Why does your Adiantum hispidulum have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely the adult stage of fungus gnats, which thrive in the consistently moist substrate preferred by Adiantum hispidulum. Their larvae feed on organic matter and fungal mycelia in the soil, but can occasionally damage delicate fern roots.
Excessive moisture levels in the potting medium create an ideal breeding ground for fungus gnat larvae and other moisture-loving pests. For a Southern Maidenhair Fern, stagnant water leads to anaerobic conditions that attract flies searching for decaying organic matter.
A substrate that is too rich in decomposing peat or compost can attract flies that lay eggs in nutrient-dense, decaying material. While Adiantum species need organic matter, an overabundance of unfinished compost provides the perfect food source for fly larvae.
Your plant might also be experiencing one of these issues:
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