The photo does not look real bad to me. It looks like the normal self thinning process so far. Also, I will point out that the cold damage on my trees last year turned black but was not fire blight. it was just cold damage. Not everything that turns black on a pear tree is fire blight. If black is accompanied by the shepherds hook shape and the little droplets of amber colored fluid where the black meets the green, then for sure you have fire blight. God bless.