I cannot find what is this in my Chinese Elm Bonsai, is this black spots?

wiliota

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I am new to the bonsai world.
And I feel like I'm going crazy? because I don't know what's going on with my bonsai.

I haven't found anything like it on the internet and forums.

A little bit of history,

  • I've had it for 1 month.
  • It got infected with white bugs, so I treated it with insecticide for flowers and fruit. And the last day I sprayed it with water and dish soap (Fairy).
  • After that, small black spots started to appear on 20% of all leaves, regardless of the type of leaf (new, small, old, large).
  • It has stopped growing, and there is a mix of healthy leaves and others that are getting black spots....

What can I do, what is going on?

Thank you
 

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Housguy

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I am not sure, but your tree looks very healthy from the pics, you have treated it for fungus and bugs, monitor it for now, but don't go to crazy, your taking care of it and elms are pretty tough trees, I am sure it will be fine. Enjoy.
 

Shibui

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Number 1. Where in the world are you? Where you are has a bearing on what's happening at different times of the year.
From the look of those leaves I'd guess they are older leaves, probably past the use by date so the tree is getting rid of them. were all these yellow leaves right down the bottom of branches?
You've only had the tree for a short time so won't know when it came into leaf or whether it had a dormant period last season. In warmer climates Chinese elm does not always drop leaves for winter but older leaves still wear out and will drop off while new leaves have grown to replace them.
The only other possibility is nutrient problem. Has the tree had fertilizer recently?

@Housguy has already spotted that all the new leaves look great so I don't think there is any real problem with this tree.
 

wiliota

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Thank you both for your answer and help.

@Shibui:
1. I am from the UK.
2. The bonsai has been nurtured twice in 1 month using Bonsai Focus. That was all.
3. The bonsai had White Bugs and it was treated with insecticide three times ( https://www.amazon.co.uk/gp/product/B096KM53KZ/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1) and the Dish Soap (Fairy) solution mixed with water.
4. Bonsai has filtered clean water (the same we drink filtered with BRITA water filter systems)

What worries me is the rate of leaf loss and that these black spots appear on any type of leaf. On the small ones that have just emerged or newly grown as well.

Are we sure this is not a fungus?
If you guys say the bonsai is fine, then my worries about a possible fungus will be lessened.


(Attached are pictures of today's leaf's taken off due to blackspots and yellowing)

20220428_122156.jpg
Thank you
 

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