Why does your Rhododendron Aberconwayi have white powder? Diagnose the cause and fix it with our step-by-step guide.
This fungal disease, caused by Oidium species, thrives in high humidity and poor air circulation around the dense foliage of Rhododendrons. The white, flour-like coating covers leaf surfaces, potentially inhibiting photosynthesis.
These small, soft-bodied insects secrete a white, waxy, cottony substance to protect themselves as they feed on the sap of the Rhododendron stems and leaves. Colonies often congregate in leaf axils or under new growth.
Certain scale species produce a white, waxy exudate that can appear as a powdery or fuzzy coating on the plant surface. These pests suck nutrients directly from the Rhododendron's vascular system.
In very wet conditions, certain fungal pathogens can leave behind dried residue or secondary white spotting as leaves dry after periods of heavy rain.
Your plant might also be experiencing one of these issues:
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