Dying leaves and branches on fruit bearing pear trees
The photos suggest that fire blight, a common bacterial disease of apple and pear, is causing these severe symptoms.
Please read our online information about this disease, including the "ugly stub" pruning technique. Sanitation is important in reducing the spread of fire blight. Spraying a copper fungicide when buds are just beginning to grow in the spring ("silvertip" stage) can also be helpful. Please read about prevention/control for fireblight in the VA Tech spray guide.
If this has been a recurring issue and the bacteria are in large scaffold branches or the trunk, these trees may weaken and decline. jt