Why does your Rhododendron Aberconwayi 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 tender new growth of Rhododendron. They often congregate in leaf axils and can lead to leaf yellowing and stunted development.
Similar to mealybugs, woolly aphids produce a white, fluffy secretion that covers parts of the stems and leaves. They thrive in the humid environments often preferred by Aberconway's Rhododendron.
Certain species of scale produce a white, flocculent covering that resembles cotton. While they don't move as much as aphids, they can cause significant damage to the vascular system of the rhododendron.
While typically appearing as a fine dust, certain fungal outbreaks can manifest as thicker, patchier white clusters on foliage in high-humidity conditions. This is common in Rhododendrons if air circulation is poor.
Your plant might also be experiencing one of these issues:
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