If you leave this page, the information you have entered will not be saved!
Are you sure you want to leave this page?
If that's the case don't spray anything on it but do keep it clean/clear of debris where fungus/bacteria may allow for more damage.
If the base has the bark buckling around the base for no apparent reason (at the root collar) where it flares out, you may have planted that tree a little too deep or may have too much mulch in that area. If that's the case, expose more of the collar and see if the tree improves over the season.
As a last resort... I'm with Douglas about taking it down.