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Sooty. Mould or Black Mould on a Rhododendron williamsianum cultivar. Sooty mould grows on the sugary secretions of sap sucking insects and while not especially damaging in itself, a dense covering can affect the ability of the foliage to photosynthesise. Rhododendrons are not especially prone to it, but this one was growing under an oak infested with aphids and scale insects. pests-and-diseases-3512htm'>Plant. Pests and Diseases
