Why does your Hydrangea macrophylla Magical Flamenco 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 while feeding on the sap of the hydrangea stems and leaf undersides. Their presence often leads to leaf yellowing and stunted growth in 'Magical Flamenco' varieties.
Similar to mealybugs, scale insects produce a white, filamentous covering that resembles cotton. They attach themselves firmly to the woody stems or leaf petioles of the hydrangea, draining nutrients from the plant.
While typically appearing as a dusty coating, certain fungal outbreaks can manifest as localized white patches on the foliage. In high humidity, this fungus thrives on the broad leaves of Hydrangea macrophylla.
Your plant might also be experiencing one of these issues:
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