I just looked at this site for the first time today and it really has a lot of great information and photos.  It is from Canada (Ontario), so everything may not be applicable to us, but still much of it is.  Look at it here:

http://www.omafra.gov.on.ca/IPM/english/grapes/index.html

In the not so distant future something like this will be available on eViticulture and extension.org/grapes for US audiences. I will try to let you know when that happens.

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