Why does your Rhododendron brachycarpum have white powder? Diagnose the cause and fix it with our step-by-step guide.
A fungal disease caused by Oidium species, which thrives in high humidity and stagnant air around the foliage of Rhododendron brachycarpum. It creates a distinct white, flour-like coating on the surface of leaves.
These small, soft-bodied insects secrete a white, waxy substance to protect themselves, which can look like powder or cottony tufts on the stems and leaf axils of the plant.
Certain fungal pathogens can cause chlorotic spots that appear pale or whitish before turning necrotic, often mistaken for powder when the leaf tissue begins to degrade.
Your plant might also be experiencing one of these issues:
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