I was going to write a post on the effects of high heat on grapevines, but luckily for me, Rhonda Smith at UC-Davis, had already done it for Practical Winery magazine.  The link is below:

http://www.practicalwinery.com/summer2011/sunburn1.htm

She has some really great information in there on berry sunburn, water management, leaf removal, row orientation, trellis design, VPD, etc.  A must read.  In this article she refers to an event last August and has included some really great photos.

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