Why does your Rhododendron hybridum hot 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. They often congregate in the leaf axils and crevices of Rhododendron stems, feeding on plant juices and causing leaf yellowing.
Scale insects produce a white, felt-like coating that resembles cotton. On Rhododendrons, these pests can cause leaves to droop and stems to become stunted due to nutrient depletion.
While typically appearing as a fine dust rather than thick cotton, severe infections can look like white patches on leaf surfaces. This fungal pathogen thrives in high humidity and poor air circulation around Rhododendron foliage.
While lace bugs primarily cause stippling (small yellow dots), their discarded skins and certain lifecycle stages can occasionally create irregular white debris on the leaf surface.
Your plant might also be experiencing one of these issues:
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