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Sooty mould, due to Dimerosforium, Aposporium, or Capno dium,
cannot exist without aphides and their honey-dew. It is a disease of late summer
and autumn. This fungus not only disfigures the plants with its black coating of
the leaves and branches, but it blocks the stomata. No direct treatment is of
any use; aphides must be controlled.
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