I've been looking for a tall citrus tree and found a 6ft tall Chandler Pommelo at Lowe's. The problem is that its leaves have yellow splotches on them, as pictured(not all, but a good handful, on all parts of the tree). Some of the smaller trees have them too but have less. Thoughts? I don't want to buy a tree that is diseased (closest I could find that looked similar is citrus greening disease) but if it's just a nutrient deficiency I don't want to pass on it. Any thoughts?