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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 they 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?
Thank in advance

I think it failed to upload pics so I re-uploaded them here

I think you are fighting the elements a little too much. Carmona is native to places with extremely humid summers. In Teheran not so humid. I keep all my plants from humid areas in temperature and humidity controlled terrarium, however no bonsai yet. 100s of beginners come here with dieing carmonas every year and experienced bonsai keepers stay away from them. The prediction is that this tree is dead within a year. Sorry, not what you want to hear. If you find a way around it, pleas let us know. Many wants to know how to grow this species succesfully.

Yeah I'm fighting elements here , I have to bring it inside in late fall and all over the winter to keep it from freezing . So eventhough I have it for like 18 months and been through all seasons in great conditions once , it's still can be the my location ? I'm gonna be sad if this is the case since its a gift and my first plant ever

18 months is indeed a good achievement.