Beginning Stage of Powdery Mildew

[rkbarnes82]

Are these the initial signs of powdery mildew or something else?



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[PapaBearJay]

Are these the initial signs of powdery mildew or something else?
View attachment 201822View attachment 201823View attachment 201824


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I think in order to say one way or the other, we'd all need pictures that were more in focus....

 

[B-Hoppy]

Looks more like insect damage from here but without clear pictures it's just a shot in the dark. There's many types of insects (and other organisms for that matter) that cause damage that can give that type of appearance and here's just one of them: http://www.extension.org/pages/31591/grape-leafhoppers-erythroneura-spp#.U4NZqChiTHM.

Here's a few links to Powdery Mildew:

http://www.uvm.edu/extension/cropsoil/wp-content/uploads/PowderyMildew.pdf
http://pnwhandbooks.org/plantdisease/hop-humulus-lupulus-powdery-mildew