I bought a Chinese Elm about two (2) months ago. I keep it outside on my deck. I expected its leaves to yellow and drop when I first got it (which is what happened).
After an initial leaf yellowing/dropping the tree greened up again and looked healthy. Over the past few weeks I have noticed more yellowing leaves. The yellowing seems to start off in one spot & then spread out over a leaf. I suspect this is from some sort of insect, but I do not know. I've seen flying insects scatter from my Chinese Elm when I water it or pick off yellow leaves.
I've read that systematic insecticides are bad for Chinese Elms and should not be used on them. Does anyone know if neem oil could be used on Chinese Elms, or will it damage them?
Thank you for your help.