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

Example Sentences

The sweet fluid is in its turn sought after by ants, and also serves as nutritive material for various epiphytic fungi—e.g. sooty mould, Capnodium, Fumago, and Antennaria—which give the leaves and honey-dew a brown or black colour.

From Project Gutenberg

Sooty Mould, the unsightly black stuff which often covers the foliage, is a parasitic fungus not upon the leaf itself but upon the "honey dew" deposited by Green Fly.

From Project Gutenberg

If therefore the honey dew is kept off by destroying the Aphides which secrete it, Sooty Mould will not appear.

From Project Gutenberg