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TOPIC: Black spots on Chinese Elm

Black spots on Chinese Elm 1 year 4 months ago #31398

Some leaves on my Chinese Elm have black spots on them. Can anyone diagnose this problem? If this is some sort of fungus, what product should I buy to treat this tree?
My tree was recently re-potted in well draining inorganic soil.

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Black spots on Chinese Elm 1 year 4 months ago #31409

The plant in the pictures is about to die. The leaves are dried out.
WHen you repotted, did you remove a lot of roots? Did yo uprotect it from sun & wind for some weeks after?
Ficus and bonsai. Lots can be said.
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Black spots on Chinese Elm 1 year 4 months ago #31430

After repotting, the tree has been exposed to morning sun from the east, and artificial lighting. Am i supposed to keep it away from the sun after repotting?
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Black spots on Chinese Elm 1 year 4 months ago #31431

I did not remove a large amount of roots.
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Black spots on Chinese Elm 1 year 4 months ago #31432

Are you keeping it indoors?
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Black spots on Chinese Elm 1 year 4 months ago #31435

Yes I keep it indoors. I live in an apt on a 25th floor. Unfortunately I don't have a balcony. However the tree has been trained as an indoor tree.
I've read that some experts avoid fertilizing their trees after repotting. I fertilized right after I repotted. Could that've had an adverse effect on the roots?
The reason I fertilized the tree was because I had read from different sources that it's appropriate to fertilize it after repotting. \
The tree's leaves are still mostly green, yet they are becoming more brittle, dry, and are dropping. Should I take it away from the sun and stop giving it supplemental lighting?
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Black spots on Chinese Elm 1 year 4 months ago #31448

It has been less than a week since I re-potted this tree about a week ago or less. Should I put it outdoors, or would moving it outdoors and then bringing it back indoors have a bad effect especially in its precarious condition?
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Black spots on Chinese Elm 1 year 4 months ago #31503

Usually keeping it out of direct light for two weeks to a month is what most of the books/courses say. What I have seen, is that as soon as the tree starts growing new shoots, it can slowly put back in the sun. I have seen/read many different ideas about fertilizing after a repot... I have found that waiting for a period of weeks is a good idea, but sometimes it depends on the species.
As far as Chinese elms as "indoor" trees, I would have to disagree. I have one that I aquired last year that was trained indoors. I put it outside in the early summer, and it has stayed outside through winter. It didn't lose all of it's leaves, and I did give it some protection from the freezes and frosts in the winter, just to be a little more sure that it would survive, and it has literally exploded with new growth this spring. I might post a thread with it's development, if I can find some older pictures.
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Black spots on Chinese Elm 1 year 4 months ago #31513

I think we can easily put rule of thumb here:

In 4 season belt, tropical and subtropical trees - indoors. All rest - outdoors. In hot summer regions indoors can go out for the summer.

Agree?
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Black spots on Chinese Elm 1 year 4 months ago #31542

Indoor trees do not exists. You just have to protect some species from the cold as not all plants tolerate temperatures below 10c or freezing. But given high enough temperatures, all plants prefer outdoor
Ficus and bonsai. Lots can be said.
Only small things can ever become big
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