Pests and Diseases forum: Identify this leaf disease?

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Aug 26, 2016 10:11 PM CST
Over the past couple of weeks my 50+ year old maple tree has been showing yellow-green leaves on the east/north side, even though it's too early for fall colors (I live in Denver, CO). Upon closer inspection, I noticed that some of these yellowish leaves are also curled and browning. Here are some pictures.

Can anyone identify the cause, and suggest treatment?

Thanks in advance,

Thumb of 2016-08-27/svarog/ec19ea
Thumb of 2016-08-27/svarog/ec9c8b

Aug 28, 2016 11:20 AM CST
I should mention that it is only happening on one side.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Aug 28, 2016 11:52 AM CST
What kind of maple is it? The leaves look more like an oak than maples I'm familiar with. It has interveinal chlorosis on those leaves - it is possible for iron chlorosis to affect one side of a tree. Did you check inside the curled leaves for pests?

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