Umbrella tree problem: I’ve been slowly losing petioles from my tree. They’re slowly turning yellow and falling off.I’ve had it for 18 months but a couple weeks ago, petioles have been quickly falling off. It gets great sun and is watered according to a meter. It has had scale for a while and I manually remove it. Scale wouldn’t cause this type of loss particularly if manually removed. I also use systemic since I’ve noticed the scale. Recently I’ve seen these weird circular white patches. I use a bio fungicide since seeing them as well as a topical bio pesticide. I’m not familiar with this since it doesn’t resemble powdery mildew. At this point a good third of my 4’ tall amate has died and I fear whatever it is has taken over. Any thoughts on fixing this or what’s causing it? I fertilize it regularly too.