Why are my trees have dead spots at the top?

Charly
by Charly
I have 3 Dwarf Pear Trees planted on my tree lawn. They are approximately 10 years old and this year we noticed that there are dead branches at the tops of each tree. Why? Are they diseased? Are they dying? What's the solution or treatment? There are 2 males and 1 female. Female in the center and she is producing runs of baby trees all over the place. These runs have gone under the sidewalk and into the lawn!

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