Hi all, I have an avocardo tree in a pot which is two years old. This spring here in Adelaide, I've noticed as the new leaves come on, all the old leaves are drooping and getting blacks spots on the top side of the leaves. They are then falling off. The new leaves are fine it is just happening to the old leaves. Refer to photos. I have seen some weird black and white bugs on the under side of a few leaves but not many. Refer to photos. I have looked up all the common issues with avocardo trees and this problem doesn't match anything. I'm at my whits end. Can anyone provide some advice as to what's going on?