Chinese Elm Trouble?
I have a well established Chinese Elm and am based in the UK.
I have just (about a week ago) got it back from a bonsai specialist who treated it for whitefly that have been ravaging it (and nearly killed it!) for the past year. He re-potted it, and gave it a really good treatment. When I got it back, it was very healthy with lots of small dark green leaves and it looked great!
Howeverm, now it has lost around a thrid of its leaves and more seem to be falling off every day- the leaves are going yellow before they fall off and I'm a bit worried as there is no signs of new growth developing! I keep it on a window sill where it is sunny but no direct sunlight and have the window at least partially open for the daylight hours. It began dropping leaves the day after we got it home. It also looked like the whitefly had started to come back at one point but I have treated it a couple of times with systemic insecticide and they have definatley gone now. I have on occasion seen litte insects in the soil and flying around the tree.... Could this be something attacking it? What should I do next?