I went to Lowe's and bought a Pineapple Pear on clearance, but after planting it, I realized it had some cracked areas all over one of the main branches that looked like cankers. Does anyone know what this is and if it is possible to save my tree?

The three pictures are:

1. An up close view of the cracks/cankers

2. A bigger view of the branch and the color variation. The branch in question is darker brown whereas the rest of the twigs and branches are still greenish.

3. The entire pear tree.