Why does your Hydrangea macrophylla Magical Dynamite have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves. They congregate on the stems and leaf axils of Hydrangeas, feeding on plant sap and causing leaf yellowing.
This scale insect produces a thick, white, waxy covering that resembles tufts of cotton. They attach themselves to the woody stems and buds of the hydrangea, potentially leading to dieback if not controlled.
While typically appearing as a flat dusty coating, certain fungal growth patterns can appear slightly raised or fuzzy in high-humidity environments. This affects the leaf surface of Hydrangeas, causing them to curl and discolor.
Your plant might also be experiencing one of these issues:
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