I bought a couple of these little guys for a group planting. The grower wasn't sure what kind of elm, but I'm assuming Chinese. Any thoughts? And they all have this chalky grey/green growth (fungus?). What is it and how do I get rid of it? And last question, what is the black growth on the nodes, (is it related to the gray/green stuff?) and how do I treat that? I'd like to go back and get a couple more, but not if this is a major problem that's going to kill these trees.