I recently came in possession of a pear tree. The last couple of years it has produced pears even though I did nothing with it. This year I planted some apple trees near it, and I'm hoping to start actually taking care of the pear tree next year. This year the pears are mostly all brown. A lot of them are rotting on the tree, but even the ones that aren't rotting are a brown color instead of what they normally look like. What is this brown on the pears, and is there something I can do to avoid this next year?

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