I live in the Los Angeles area. I have three grape vine I planted about six years ago. The first year they did very well. The second and third year in had a great crop if grapes. The vines get direct sun light all day. They are frowning on a trellis about 8 feet off the ground. These last few years the grapes turn black and get moldy. The local nursery suggested copper. It is really hard for me to spray them three times a week so the problem is not going away. My wife wants to pull them out but I would like to save them. Thanks!