Apple tree bark splitting

Attachment 37254 (http://www.doityourself.com/forum/attachments/gardening-horticulture/37254-apple-tree-bark-splitting-image.jpg)Attachment 37255 (http://www.doityourself.com/forum/attachments/gardening-horticulture/37255-apple-tree-bark-splitting-image.jpg)Attachment 37255 (http://www.doityourself.com/forum/attachments/gardening-horticulture/37255-apple-tree-bark-splitting-image.jpg)Attachment 37256 (http://www.doityourself.com/forum/attachments/gardening-horticulture/37256-apple-tree-bark-splitting-image.jpg)Attachment 37256 (http://www.doityourself.com/forum/attachments/gardening-horticulture/37256-apple-tree-bark-splitting-image.jpg)My 15' Macintosh dwarf appears like it's growing faster than the bark can accommodate and has vertical splits and scars of this happening in the past. The leaves are also spotted so I'm sure it has a fungus or mold growth of some sort. Lots of green this years and only about 10 ugly apples that adventually dropped off. I pruned of a ton of branches to try get more sunlight in the interior of the tree 2 weeks ago.Attachment 37254 (http://www.doityourself.com/forum/attachments/gardening-horticulture/37254-apple-tree-bark-splitting-image.jpg) any ideas what to do???