Why does your Red Zantedeschia aethiopica 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 matter required by Calla Lilies. Their larvae feed on decaying roots and fine root hairs, which can compromise the plant's ability to uptake water.
Excessive soil moisture creates an ideal breeding ground for fungus gnat larvae and can lead to Phytophthora, a common pathogen in Red Zantedeschia. This environmental condition attracts flies seeking damp organic substrates.
High levels of decomposing compost or peat moss in the potting mix can attract various small flies looking for a food source. While not directly a disease, it indicates an environment prone to fungal growth.
Your plant might also be experiencing one of these issues:
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