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sooty mould

noun
1.
a fungal plant disease characterized by a blackish growth covering the surface of leaves, fruits, etc
2.
any of various fungi, such as species of Meliola or Capnodium, that cause this disease
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for sooty mould

black mold

plant disease characterized by splotchy black stain or coating on leaves, stems, and fruit, composed of dark fungal threads (Capnodium, Fumago, and Scorias species) that grow in flowing sap or on honeydew excreted by aphids and other sucking insects. The condition is unsightly but usually not harmful. Control includes spraying or dusting for sucking insects, washing off sticky coatings of sap or honeydew on plant surfaces, and avoiding the wounding of plants.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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