I recently bought a fireglow from the nursery and found some white spots on the leaves after a couple of weeks sitting in my backyard. It is still in the pot and the cloth coming from the nursery and I put it in the place where I would like to plant the maple later. The location receives morning sun and the shades move in after 3-4pm. The spots will eventually "burn" through the leaves. One observation is that the white spots only appear on one side of the maple (east side) and in the lower part of the tree. The top leaves are perfectly fine. Also I have a waterfall (in pot) about 6 feet away from the fireglow and it is perfectly fine. I water both the maples twice a day, more water in the morning and just wet the soil in the evening. The container for the fireglow has pretty well drainage so I usually give it more water to make sure the soil in the cloth receives enough water. It would be very appreciated if someone can tell me what the white spots are and how I can fix this problem. I am new to japanese maple and like this tree very much, I don't want to lose it because of whatever I do wrong. I've attached a few pictures of the leaves. Pardon me about the quality of the picture. I don't have a good camera to take some close up. Thanks.