Diseased Norway Maple?

[Nudest]

Hello all,

I have a 60-year-old Norway Maple in front of my house. It was planted by and is still owned by the City of Toronto. For the first time I have noticed large yellow blotches on almost all the leaves. Is this indicative of a disease?

The only thing different about this summer is that it has been wetter and cooler than usual.

Thanks in advance for any help or suggestions.

Denny

Images at

[Paulo]

Hi Denny, I am in Toronto and I live in dtwn. TOday walking along Front St I noticed the same yelowish patches in the street maples....I am also wondering whats that.....fungus?

[Mike LaMana]

In NY area yellow spots appearing in Norway maple trees are a common site in the urban forest. These are usually associated with a tar-spot (fungal) disease that is merely cosmetic.