Does this look like a nutrient deficiency or fungal problem?

INDIGO-STEVE

Yamadori
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This is my first year with this European Hornbeam. I routinely treat the tree with Cleary's 3336F and I live in North Carolina zone 7b. Any help would be greatly appreciated.
 

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Shibui

Imperial Masterpiece
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When I see burnt leaf margins like that I assume dehydration first.
Note that dehydration can also be caused by too much water. If root tips rot the trees cannot take up water and dehydrate even though the soil is saturated. Saline water can do the same thing.
Interesting that it has occurred on older leaves but newer leaves are not affected. When did the brown appear?
Some background like how much fertilizer and how often, soil type, watering, etc may suggest some possible answers.
 

Brian Van Fleet

Pretty Fly for a Bonsai Guy
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Agree, this tree appears to have dried out. This time of year around here, it can be dry and the sun is still hot, yet lower in the sky. I find that trees that were in the shade often get hot sun In the afternoons…tough combo for trees like hornbeam and beech. Keep watering, it will be fine.
 

rockm

Spuds Moyogi
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That looks like the result of sunscald. Probably too much sun over the summer. Damage done to leaves over the summer can show up in the fall.
 

INDIGO-STEVE

Yamadori
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When I see burnt leaf margins like that I assume dehydration first.
Note that dehydration can also be caused by too much water. If root tips rot the trees cannot take up water and dehydrate even though the soil is saturated. Saline water can do the same thing.
Interesting that it has occurred on older leaves but newer leaves are not affected. When did the brown appear?
Some background like how much fertilizer and how often, soil type, watering, etc may suggest some possible answers.
I bought this tree at the beginning of spring from the BLC. The tree is potted in a 2-1-1 mix and is moderately fertilized with Bio-Gold and a monthly dose of liquid fish and kelp. The tree spent the summer under a 35% shade cloth. Over watering is definitely a possibility. I recently started paying attention to water PH (I use city water). The pH of the water reads anywhere between 8-10 before I add a little citric acid to bring water pH to 6-7. Maybe me fixing water pH is why the new growth looks healthy. I appreciate everyone who commented on this. P.S...... Does anyone know where I can find Stewartia Monodelpha stock?
 
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INDIGO-STEVE

Yamadori
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61
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Location
Kannapolis N.C
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I bought this tree at the beginning of spring from the BLC. The tree is potted in a 2-1-1 mix and is moderately fertilized with Bio-Gold and a monthly dose of liquid fish and kelp. The tree spent the summer under a 35% shade cloth. Over watering is definitely a possibility. I recently started paying attention to water PH (I use city water). The pH of the water reads anywhere between 8-10 before I add a little citric acid to bring water pH to 6-7. Maybe me fixing water pH is why the new growth looks healthy. I appreciate everyone who commented on this. P.S...... Does anyone know where I can find Stewartia Monodelpha stock?
 
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