Hi, I noticed last night that my acer palmatum katsura is having some problems. Many leaves are dying. I couldn't see any bugs, but I only got a chance to look at it for a minute. I also have an acer palmatum osakazuki, but it seem to be fine (although I've had to chase aphids off of it once or twice). I'm hoping someone can provide some insight into what may be happening with the katsura, and whether I need to do anything about it. thanks, Doug