These are Canadice grapes. This vine has yellowing leaves with brown spots and I just noted that some bunches have these brown scars on them. It's hot here in the summer...Reno...around 100 degrees for 2 weeks now. Unfortunately, these vines are on a central irrigation system with other yard plants. It has a 2gph drip that is currently on once a day for 25 minutes. Any idea what these brown scars are? Thanks
