Why does your Rhododendron micranthum have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
Mealybugs are small, soft-bodied insects that secrete a white, waxy, cottony substance to protect themselves. They congregate in the crevices of Rhododendron stems and leaf axils, sucking sap and weakening the plant.
Similar to mealybugs, scale insects produce a white, felt-like coating. They attach firmly to the plant tissue, often causing yellowing of the leaves around the infestation site due to sap depletion.
This fungal disease manifests as a white, dusty coating on leaf surfaces. While often appearing as a fine powder rather than distinct 'cottony spots,' heavy infections can look clumpy and fuzzy.
In high-humidity environments, certain molds can grow on decaying organic matter or dead leaf tissue at the base of the Rhododendron, appearing as white, fuzzy patches.
Your plant might also be experiencing one of these issues:
English
Italiano
