Chinese elm leaf diseases

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Hi,

I have a 2 year old Chinese elm I've grown from seed, it has begun to get yellow spots that turn to brown on some of the leaves. Not ask the leaves have it and I've been removing the affected leaves. Can anyone please tell me what this is and how to treat it?

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.bonsaiempire.com/forum/pests-and-diseases/10340-chinese-elm-leaf-diseases

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