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. You never contact all the pests with one application and those that survive are the primary reason for retreatments a couple of time at 2 week intervals.
The squiggly lines may be due to leaf miners which are not a cause for concern. I suggest taking some samples from you tree to your County Extension Office for diagnosis and control suggestions.
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