Honestly, I wouldn't worry about it. This happens to a lot of tree's, and can be caused by a shortage of water to that branch, or bugs. I would just trim of the dead branch and hope for the best

God Bless,Daryian

I cann't see the tree real well, but it looks like fireblight. If so, that is a serious problem. Read up about fireblight and it's control. Normally one cuts out the affected limb and about a foot more of healthy wood. But you can spread the disease on your pruning shears. Because of that I've read some that recommend ripping the branch out, where that is possible.

Some spray antibiotic but that is more preventive and will not cure what you have now if indeed it is fireblight. Cut down on fertilizer and water if possible. A vigorous young tree like yours is fireblight heaven. Good luck!!

The Fruitnut

I haven't used any fert on it this year,and the only watering is from the rain...Thanks guys

I doubt it is fireblight. I say this only because that one branch has been completely taken while the tips of the other branches are unaffected. I would have expected alot of other branches, starting at the tips, would have blackened and wilted by now.
Cut that one branch all the way back to its base.

Its at least two branches, there's another one on the right, and the tree seems to be growing pretty vigorously to me, must be fertile soil.

Looks like fireblight to me, and I'm very familiar with it.
I'd prune those affected limbs out pronto! Before the infection spreads into the main trunk. You need to cut at least 6 inches below the current extent of blackened/damaged stem, and disinfect the blades of your pruners between cuts.

Do you know what variety your pear is? Or, at least what label was on it when it was purchased?
Some, like Keiffer and Orient, can take a FB hit, shrug it off, and keep right on ticking, while others, like Bartlett, are extremely susceptible, and often succumb rapidly to FB strikes.

I pruned the affected limbs yesterday.Lucky-this is a keiffer pear,I think it's supposed to be more resistant to fb than most types.Thanks for all of the input guys.the more responses-the better.