I'm not sure how large a tree you are talking about. A "young" tree will react to treatment better than an older tree. The most active feeder roots are at or just beyond the drip line of any tree. A healthy tree will be much more resistant to disease etc than one that is struggling. Nitrogen will move downward in the soil by leaching, Phosphorus moves not at all and if applied to the top of the soil without incorporating it is lost in runoff. You did not mention pH and soil types, both of which will have a big impact.
Generally, the rule is not to fertilize trees. Application of Nitrogen gives a rapid flush of growth which makes the tree more susceptible to wind damage and definitely is more attractive to deer as they like the salt.
About the only proven method of combating the disease is injection into the cambium layer (just under the bark).
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