Sick carmona (fukien tea) having yellow leaf

prongs

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Hello everyone, I have a carmona which started to have some yellow leaf since last month. It was one or two yellow leave every other day and I thought like it's normal but they started to get more and more.
The only thing that changed recently was the fertilizer. I couldn't find the same one I'm regularly using so I used a new brand. Also I fed my trees with Calcium and Humic Acid for the first time in last year, suggested by my cousin. After a week or two now it has a lot of yellow leafs and brown markings on the green ones. I don't know what to do. Is there a kind of disease or it might be from the nutrients I fed it?
In case it helps: my other elm and maple tree are doing just fine and I fed them too.
The watering is regular, I water it when it feels dry on surface and it's placed in balcony receiving 4 to 5 hours of direct sunlight. I live in Tehran-Iran, it's 28 to 40 C here and humidity is low. I try to spray some water twice or 3 times a day.

I really appreciate any information and instructions, should I place it in shadow or stop fertilizing or change watering pattern? 20210705_095806.jpg20210705_095754.jpg20210705_095738.jpg20210705_095725.jpg20210705_095733.jpg20210705_095702.jpg20210705_095649.jpg20210705_095642.jpg
 

sorce

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I'd stick with elms and maples!

Welcome to Crazy!

Sorce
 

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