Why does your Zantedeschia aethiopica have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
The tiny black flies are likely fungus gnat adults, which thrive in the moist, organic-rich soil that Calla Lilies require. Their larvae live in the top layer of soil and feed on decaying organic matter and occasionally fine root hairs.
Constant moisture in the rhizome zone creates an ideal breeding ground for fungus gnats and can lead to secondary issues like rhizome rot. Calla Lilies prefer moist but well-draining soil, and stagnant water promotes insect activity.
Old, dying leaves or decomposing mulch on top of the Calla Lily pot provide the necessary food source and habitat for insect larvae. As these tissues break down, they attract scavengers like gnats.
Your plant might also be experiencing one of these issues:
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