Why does your Rhododendron edgeworthii 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 stems and leaf undersides. Their presence often leads to leaf yellowing and stunted growth in Woolly Rhododendrons.
Scale insects produce a white, powdery or cottony coating on the plant surface to camouflage themselves. In Rhododendrons, they can cause significant sap loss and eventual branch dieback if left untreated.
This fungal disease manifests as a white, flour-like coating on the foliage. While it looks like cottony spots initially, it typically spreads to cover larger surface areas of the leaves.
Certain species of aphids produce a white, waxy secretion that resembles cotton. These pests thrive in the humid environments often preferred by Rhododendron edgeworthii, leading to curled leaves.
Your plant might also be experiencing one of these issues:
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