Why does your Zantedeschia Captain Signum 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 matter of Calla Lily potting soil. Their larvae feed on decaying plant matter and fine root hairs, potentially causing root damage to your Captain Signum.
Frequent overwatering or a lack of drying time between waterings creates the perfect humid microclimate for gnats to breed. Calla Lilies prefer consistently moist but well-draining soil; stagnant moisture triggers pest outbreaks.
If you have recently added compost or high-nitrogen fertilizers to the Zantedeschia, the decomposing organic material serves as a primary food source and breeding ground for flies.
Your plant might also be experiencing one of these issues:
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