Why is the bark on my tree turning black?

Gardens & Landscapes January 07, 2008 Print Friendly and PDF
The black material on the tree is probably sooty mold, a fungal growth that grows on 'honeydew'. Honeydew is the excrement produced by aphids feeding on the tree leaves. This fungal growth (sooty mold) can be seen on many tree species on the trunk, branches, twigs and leaves.

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.