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Grapefruit Trees

Q.The grapefruits on my tree have stopped growing.

Zone 9 | Mdgordon added on September 1, 2012 | Answered

There is black mold on the leaves. How do I manage the tree?

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Certified GKH Gardening Expert
Answered on September 2, 2012

It sounds like the tree has sooty mold (the black you are seeing), which is actually an indicator of a pest infestation. I would recommend treating the tree with neem oil. This will treat both the pests and the sooty mold fungus. Here is more information that may help: https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

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