The black sooty mold is probably the result of sucking insect damage such as aphids, mealybugs or scale. Confirm the problem at your local garden center. If it is, for sucking insects spray with a suffocant such as a horticultural oil but spray in the early evening to avoid burning the foliage during the heat of the day. There are also chemical systemics but make sure it is recommended for your particular plant and you would need to get rid of the current problem first and the systemic would be for future control. Also look for ants as they farm the sucking insects for their honeydew, excreta from the insects that leads to the black sooty mold. Use a bait that ants take back to their nests to kill the entire colony and the queen.
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