Why does your Rhododendron decorum have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These sap-sucking insects secrete a white, waxy, cottony substance to protect themselves while feeding on the Rhododendron's tender stems and leaf undersides. They can weaken the plant significantly by draining nutrients.
Scale insects often appear as white, cottony masses on Rhododendron foliage. They attach to the plant and pierce the epidermis to extract sap, often leaving behind a sticky residue known as honeydew.
While usually appearing as a fine white dust rather than distinct 'cottony' clumps, certain fungal strains can create thick, felt-like patches on Rhododendron leaves in high humidity.
These aphids produce a white, waxy secretion that makes them look like tufts of cotton clustered on new growth or flower buds.
Your plant might also be experiencing one of these issues:
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