It sounds like the tree is just suffering through drought stress. Black tupelos can grow in wet soils but are also adaptable to dryer environments. In times of drought you can supplement irrigation by watering at the base of the tree about once a week if we aren't receiving sufficient rain. Trees need about an inch of water a week and as they are getting established to their new environment and focusing energy on root development this is crucial. As they mature and settle in, they can withstand periods of drought better. Typically it takes a tree about 3 years to establish its root system, so this is the most important time period to monitor for watering needs.

You can refer to our webpage on watering trees and shrubs for more guidance. The tree should survive and be fine. 

If you have further questions, please feel free to send us in some photos so we can better assess the situation. 

Emily