Why does your Adiantum capillus veneris have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyThe tiny black flies are likely fungus gnat adults, which lay eggs in moist soil. Their larvae feed on organic matter and decaying root systems of the Maidenhair Fern, often thriving in the high-humidity environments these ferns require.
Maidenhair Ferns require consistent moisture, but stagnant, waterlogged soil creates the perfect breeding ground for fungus gnat larvae. Excessive moisture can also lead to root decay, providing more organic material for pests to consume.
The use of heavy, peat-based potting mixes that have begun to decompose can attract fungus gnats. As the organic material breaks down in the pot, it creates a nutrient-rich environment for larvae to thrive.
Your plant might also be experiencing one of these issues:
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