I need some help diagnosing a maple problem. 4 days ago I purchased a red leaf maple (acer rubrum - burgundy belle) from one of the local nurseries. All of my other plants and trees that were purchased look fine, but this one. I planted it 3 days ago. last night I noted the leaves on the lower branches were discoloring - yellow / red / brown. Today, the leaf discoloration is progressing up the tree and the lower leaves are wilting and falling off. The tree has been watered at least twice a day due to high heat. Any ideas what is is and how to treat it? Thank you!!!

Here is a link that might be useful: maple discoloration pictures