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Sooty mould fungus growing on a New Zealand Beech tree. The black mould grows on the honeydew secreted by scale insects and aphids. Bees feed on the honeydew and can often be seen on the blackened trunks. When sooty mould is present on the foliage, it can cause damage by lessening a plant's ability to photosynthesise sugars. pests-and-diseases-3512htm'>Plant. Pests and Diseases
