Fall Season Powdery Mildew?

thatguy

Mame
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Location
Manchester, NH
USDA Zone
5b
Hi All,

Recently spotted some of what I believe to be powdery mildew on my maples. I thought at first it was just hard water spots but now I think it is mildew. It affects a few leaves on some palmatum seedlings, a few leaves on a little koto hime and a bit more widespread on a dwarf palmatum.

Is this common in Fall do to the increased dew in the mornings? When I water I don't get much of the foliage wet. Should I treat them with copper fungicide or is it close enough to leaf drop to not be a concern? See attached and thanks!
 

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I wouldn't worry about it.

Sorce
 
Mine is doing something similar and I’m stressing out
 
I like not worrying! Anytime I'm able to "not" worry about something is a huge victory in this day n age. Thanks for the reassurance :)
 
my acer palms get this, nothing to worry about. water overhead for a second and it comes right off.
 
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