Plum tree. Blight? Bacterial Spot?

What is wrong with my plum tree? I am having this issue on a Santa Rosa and Methley. It has been a wet and humid spring. These were planted in March, and came from Lowe’s. I know now that was a poor choice. They have holes in leaves, some turning yellow and falling off, and some new branches are turning black and shriveling.

Any thoughts?