Answer: Although the black leaves could be due to fire blight, it generally strikes entire shoots and leaves rather than individual leaves. Fireblight primarily attacks in the spring. Prune out infected shoots a few inches below the dead area and remove them from the area. If only portions of leaves are turning black rather than blighting of entire leaves and shoots it may be due to a root related problem. Physical root injury, poor soil drainage and burn from excessive applications of dry fertilizer can cause such symptoms. In your case it may simply be the result of overly soggy soils. I'd start by pruning out all the affect leaves and limbs and take a wait and see approach. Good luck with your pear tree.
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