Why does your Zantedeschia Red Alert have tiny black flies? Diagnose the cause and fix it with our step-by-step guide.
These small flies thrive in the moist, organic-rich soil typically used for Zantedeschia. The larvae feed on decaying organic matter and can damage the developing root system of your Calla Lily if the infestation is heavy.
Excessive moisture in the pot creates an ideal breeding ground for fungus gnats and can lead to root rot in Zantedeschia. The lack of oxygen in saturated soil promotes the decay that attracts these flies.
The presence of fresh compost or decomposing peat moss in the Zantedeschia potting mix provides a nutrient source for fly larvae. As these materials break down, they release gases and moisture that attract pests.
Your plant might also be experiencing one of these issues:
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