Problem with blueberry leaves

Question

Hi
I’m Kourosh. I have problem with my new blueberry bush. Last November, I planted BB seeds in a pot and they germinated. Because of 20% air humidity off my region I used plastic bag to help it grow. I’m using Humic Acid(Humax) fertilizer 1cc per liter monthly for the root, plus micro element fertilizer every two weeks for leaves by spraying it. I also spray Captan anti fungus monthly. Because of weakness of new plant, I use the combination of fluorescent and a mild indirect sunlight for growing it. (Using a 18w led grow light from 30cm above, made the leaves’ color turn to red so I stopped using it). Now the problem is that yellow spots are appearing on the small leaves of the older branch. It has two branches now. I don’t know what to do. It’s the only BB I have and if failed, I have to start over. Please take a look at pictures.

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Answer 1

First thing, I think it is in too large a pot for such as small bush. That causes too much moisture and root rot. Plus, blueberries don't need all the additives you are giving it. I would replant in a pot that is just one size larger than the rootball. Also, make sure your soil is acidic. Then stop all the feeding.

Here is more care for your blueberry bush:
https://www.gardeningknowhow.com/edible/fruits/blueberries/growing-blueberry.htm