Beginner Gardening: Cracks & lesions on pear and apple bark newly planted trees, 1 by Mraur

Mraur wrote:
Hi Diana, thanks for your response!
Yes, I put up some deer netting - so far, the deer have left them alone and I put wire collars around the bases in case rabbits get any ideas. I brought them home in the back of a truck, so they definitely could have rubbed against each other in transit - though I know some of the trees had some rubs, lesions, and nibbled spots before I even brought them home. I'm just wondering if these might heal themselves or if it's better to prune back the damaged areas and let the tree start over?

The pears worry me a bit more as they seem to have more lesions and I worry it might be fireblight or some other bacterial or fungal disease causing the splitting bark. Would these be considered "cankers"?