Why does your Zantedeschia aethiopica have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
The fine webbing is a classic hallmark of spider mite infestations, which thrive in the warm, dry conditions often experienced by Calla Lilies. These microscopic arachnids pierce plant cells to suck out sap, leading to stippling on the leaves and eventual chlorosis.
If the webbing is dense and covers large areas of the foliage, it indicates an established colony that has moved from individual leaf feeding to creating protective silk structures. This often occurs when Calla Lily humidity levels drop too low.
In extremely high humidity environments with poor air circulation, fine fungal filaments or dust trapped in moisture can sometimes mimic a web-like appearance on the thick, waxy leaves of the Calla Lily.
Your plant might also be experiencing one of these issues: