Your bradford pear has a disease called Cedar x Hawthorne rust. The fungus that causes this disease has the very long name Gymnosporangium juniperi virginianae. The fungus actually attacks two different kinds of trees, cedars/junipers and plants in the rose family (Rosaceae) such as apples, pears and quince. The fungus is reproducing on the fruits on your bradford pear and growing those orange structures where the fungal spores are released. First you should know they are not harmful to you. The same fungus also infects the leaves, causing the premature defoliation the tree is experiencing. Usually we do not make a recommendation to control this problem. In most years it is very light and you may not even notice it. Apparently the environmental conditions were just right in the Dallas area and you are seeing a severe infestation. I am going to recommend you visit the website below for more details about management in the event you decide to do so. However, it is really to late this year to do anything about it, and chances are next year a similar infestation will not occur.  I hope this helps... 

 http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advi...