My 4 ft lemon tree was delivered 6 days ago to me in Maryland. It was indoors for 2 days and outdoors for 2. Brought it back in because the weather turned a little chilly. The tree is in the same container in which it was delivered. After 2 days inside again, it has developed light brown scaly spots, some 2 inches long, on the underside of leaves. A few of the leaves seem a bit curled, and one or two show the scales, but still green, on the leaf surface. I need advice as to what this problem is and how to stop it in its tracks. It has only been with me a short time, but I fell in love with the tree at first sight.