Answer: Your tree is suffering from more than one ailment most likely. The sooty mold is a sign of certain insects such as scale, aphids, mealybugs or whiteflies. Summer oil sprays can help keep these in control if you follow label instructions for mixing and applying them, making sure to get thorough coverage when you spray. Repeated applications will be needed as oil sprays are not poisons but rather smother the pests and don't provide residual control. Or, you can hose your tree off every few days with plain water to discourage aphids and whiteflies. good luck with your tree!
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