sooty mould

World English Dictionary
sooty mould
 
n
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 10th Edition
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Encyclopedia Britannica
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sooty mould

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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