Black sooty mold = honeydew from aphids/plant lice. Ants farm aphids. Blast off with strong water spray; compost tea + orange oil works better. Root cause: tree stress (water, fertilizer, compaction, chemicals, deep planting). Fix stress; pests leave. LOC (Amway) 1 cup/gal safe wash. Forceful hose stream may suffice. Identify stressor; don't just treat symptom.
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