Hi Mahalia, Black soot grows on the sweet secretion that insects leave behind. To dry out and over time remove the black soot spray with Free flow copper. (note the Free flow copper will dry up the black soot but it does take time for wind and rain the remove it from the leaves. To stay on top of the insects just spray with Enspray oil every 8 -10 weeks this will control most insects and hence the food source for the black soot.
Thanks the Palmers Team
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