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Sooty MoldSooty moulds are a group of fungal growths which colonize sugary deposits on plants. These deposits may include sap dripping from pruning wounds or frost cracks or excretions from feeding insects like aphidsscale or mealybugs.

Even though maples have light coloured bark, annual aphid feeding provides a reliable source of honeydew for sooty mould colonization, which then turns the bark black.


Sooty moulds can be indirectly controlled by reducing populations of sucking insects that excrete honeydew. Outdoor furniture can be hosed down with water during periods of honeydew excretion, particularly during drought.

The growth of sooty mold fungi is inhibited by preservatives used in treated wood in rustic outdoor furniture. Recipes for cleaning solutions to remove sooty moulds from plastic or painted surfaces can be found on the Internet.

Last updated: 2/28/2017 3:46:39 PM