Why does your Zantedeschia Captain Melrose have white powder? Diagnose the cause and fix it with our step-by-step guide.
A fungal disease caused by pathogens like Podosphaera aphanis that thrives in humid conditions with poor air circulation. It creates a characteristic white, flour-like coating on the leaves of Zantedeschia, eventually leading to leaf yellowing and necrosis.
These sap-sucking insects secrete a white, waxy, cottony substance to protect themselves. They often cluster in the crevices of the leaf stems and petioles of Calla Lilies, causing plant stress and stunted growth.
Calcium or magnesium carbonates from tap water can leave a white, crusty residue on the surface of leaves if water is sprayed directly onto them. Unlike fungus, this is inorganic and does not spread across the plant tissue.
Your plant might also be experiencing one of these issues:
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