Why does your Hydrangea macrophylla Magical Ruby Red 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 and their eggs. They feed on the sap of the Hydrangea, often clustering near leaf axils and tender new growth.
While typically appearing as a dusty film, certain fungal stages can look like tufts of white fuzz on leaf surfaces. This fungus thrives in high humidity and poor air circulation around the dense foliage of Hydrangeas.
Similar to mealybugs, scale insects produce a white, filamentous coating that resembles cotton. They attach themselves firmly to the stems of the Hydrangea and can cause significant sap depletion.
Your plant might also be experiencing one of these issues:
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