Why does your Red Zantedeschia aethiopica have fine webbing? Diagnose the cause and fix it with our step-by-step guide.
The presence of fine webbing is a classic hallmark of spider mite infestations, which thrive in the warm, dry conditions often experienced by Calla Lilies. These arachnids pierce plant cells to suck out sap, leading to stippling and eventual leaf decline.
This specific species is highly prevalent in indoor or greenhouse Calla Lilies and produces dense silk webs around the base of the spathe and leaf junctions. They are particularly active when humidity levels drop below 50%.
While not a direct cause, stagnant, humid air around the large leaves of Red Zantedeschia can create micro-climates that encourage mite populations to boom. This often happens if the plant is crowded in a corner with poor circulation.
Your plant might also be experiencing one of these issues:
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