Experts and BHG readers answer.
Poor Pear Tree
It certainly could be fire blight. Trim off all diseased branches, making the cuts several inches below the lowest sign of disease. Dispose of all the trimmings promptly, including leaves and fruit, by sending it away to the composter or burning.
Next year, if you see dead shoots among the green, healthy foliage, trim them out promptly.
There are copper-based sprays that you can use to reduce blight. IT can be a lot of trouble if the tree is large, and expensive to hire it done by an arborist. But that's an option, just so you know. Often, just trimming and disposing of affected parts is enough to manage it.