I have a 9 year old Japanese cherry tree that has a severe bark split. I have not done anything yet, but the inside looks like there is a sticky substance . The tree did not bloom this spring at all. Leave coverage is about 70% compared to other years. The spit is facing west where it has the most sun exposure and we had the coldest winter last year. Will the tree survive? Should I fertilize it? Is there anything else I should do?