Leaf burn or fungus?

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Location
Salt Lake City, UT, USA
USDA Zone
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Please help. I noticed this morning a sudden decline in leaf health on my bonsai. Orange discoloration that seems to start at the leaf margins and eventually kills the whole leaf. We have been getting some intense heat and low humidity lately, so I am hoping just leaf scorch, but want to ensure it isn't something worse

Hawthorn:
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Japanese flowering quince:
0712211535a_HDR.jpg

Pyracantha:
0712211535.jpg

Beech:
0712211536_HDR.jpg

Trident:
0712211536a_HDR.jpg
 
Messages
490
Reaction score
596
Location
Salt Lake City, UT, USA
USDA Zone
7a
The more I research, the more I am thinking leaf scorch. I may just go ahead and relocate all of my trees out of full sun. Does anyone think that I should discontinue overhead watering in case it is fungus?
 

Wulfskaar

Chumono
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Location
Southern California
USDA Zone
10a
From my internet research, it's leaf scorch or too much fertilizer.

I had some leaves looking similar last month so I did similar research. I still don't know what the problem with mine was, but I'm leaning towards leaf scorching because my fertilizer is rather weak.

After moving the trees (babies) into a less sunny spot, they started coming back.
 

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