Hi there, I am noticing some troubling things with these two potted maples. I have had them both for about 3 months (purchased from the same nursery) and have re-potted them both into larger terra-cotta. My kamagata is exhibiting some leaf browning at the tips that I thought was related to the heat/sun, but the entire leaf is getting yellow spots.. :( 001 by brierphoto, on Flickr My Shichihenge has something that appears completely different- tar spot, perhaps? Dark brown spots/streaking on the leaf. 060 by brierphoto, on Flickr I've treated all my maples twice with Serenade. http://www.hydroponics.net/i/101023 But, neither tree seemed to respond.. I have a 1 year guarantee on these trees... thoughts?