When you say citrus heart rot, it's the rotting of the citrus tree's trunk which is also called ganoderma rot. It is characterized as a mushroom-like fungi that starts to form on the trunk. When this disease is ignored, it can move up to the higher part of the tree in strands called rhizomorphs, and eventually it can be the cause of the tree's death. Treatment of this is disease is impossible so the best way is to remove the infected tree so as to prevent further damage.

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Source: Gardening Know How