liberty apple tree planted 2 months ago. leaves yellowing and dropping off. Is this iron deficiency, magnesium, cedar apple rust, or necrotic leaf blotch(thought could only happen to golden delicious). I mended the clay soil by tilling it and raking a bag of composted manure . Added fertilizer to it a month ago. The belmac apple 12 feet away has had no problems and planted the same way. Yet the liberty on the left is only one that bloomed flowers which could of resulted something. So i dont waste money and try to correct everything, anyone got suggestions?