Burn on white grapes.
Got burn on some white grapes. Property is extremely hot and dry and peak months it's gets into the high 90's and stays in the 80's until 6-7p.m. How to prevent avoid burn. The weird thing was the burn happened after berries were fool size.
Orange County California viticulture
If I understand correctly, this past summer you got some sunburn on your white grapes in your yard?
One thing you can do is to make sure that the canopy shades the fruit during the hottest part of the day, typically this is easy with a trellis. Do you have the vines on a trellis?
What is your watering regime like during the hot days? Watering a little bit at a time will help to minimize water stress, which may have led to the sunburned fruit.
This article on eViticulture.org may help: http://articles.extension.org/pages/31610/sunscald-damage-to-grapes
Hopefully these suggestions will help you to avoid burn next season!