Why does your Zantedeschia elliottiana have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist, organic-rich soil that Zantedeschia elliottii requires. Their larvae feed on decaying organic matter and can damage the delicate tuberous roots of your Calla Lily.
Excessive moisture in the rhizome zone creates the perfect breeding ground for fungus gnat larvae. For Zantedeschia, soil that does not dry out between waterings leads to high humidity at the soil surface, attracting pests.
If there is old, decomposing peat or compost in the pot, it serves as a primary food source for the life cycle of small flies. As Zantedeschia rhizomes age, organic debris buildup can trigger infestations.
Your plant might also be experiencing one of these issues:
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