Beginner Gardening: autumn blaze maple looking rough, 1 by dolphinjones72

dolphinjones72 wrote:
I planted an autumn blaze last Aug. 2010. It shed it's leaves in the winter and shot out real well this spring. In July the tree started looking rough. Leaves are turning brown-black and crispy then falling off. Growth of new leaves looks stunted. I live in North Fla. zip 32063 zone 9. I do think I have poor soil. Though I've never tested the ph. Gumbo clay people call it around here. I have read on some sites that this tree likes iron and magnesium. Also read it gets a "black leaf disease" that is incurable. Any advice is welcomed. Thank you. Pic included.