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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.

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.

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