Your sugar maple is probably a victim of leaf scorch, which is caused by too little water in the soil or a physical restriction of its roots. This is best combated by deep watering, especially during dry periods.
It can be a case of leaf scorch OR salt injury. With leaf scorch, make sure deep-watering is done during dry periods. Your sugar maple is more vulnerable to salt injury if it is planted near the road, as passing cars can spray water to the lower branch of the tree, or if run-off water is absorbed on the roots (salt injury from this usually leaves damage on the upper portion of the tree rather than the lower one). Please look at the below link for more information regarding salt injury.
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