Identification: Fungus on Maple tree leafs

Hello,

I have discovered a white powdery fungus on the leafs of my maple tree. I've attached a picture. Can someone please help me identify this fungus and how I should treat it. It has infected about 50% of the tree.

Thank you...James Hamilton

 

James,

Not sure, but it looks like a type of powdery mildew. See what you think http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=713

Tim

 

Thanks Tim. I think you correctly identified it. Say, do you know where I can purchase the chemicals listed on your link?

James