Acer ginnala - weird leaves

Krone

Mame
Messages
248
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78
Location
Slovenia
USDA Zone
7b
Can someone identify what could be wrong? Have couple of leaves that look like this.

WhatsApp Image 2020-03-15 at 13.45.43.jpeg
 

Gsquared

Shohin
Messages
384
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1,148
Location
Portland (ish), OR
USDA Zone
8B
My tridents used to have something similar in California. The nurserymen I asked called it “water mold spores”. They said it was a minor fungal infection caused by warm, damp nights. I’ve never had it hurt the tree, just make those few early leaves look a little ugly. It resolved itself once the leaves hardened off.
 

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