I planted two grape vines near each other about 3 months ago. One is Thompson seedless and the other a common purple variety (flame, probably). They both grew very well, to 6-9 feet up the trellis, then began to both have serious problems, beginning with the newest growth and working down the plant. Some of the first growth is still holding up pretty well, but the top half of both plants is almost entirely shriveled up, as seen in the photo. I wish I didn't have to come ask for help, but I'm a really busy newbie! Thank you for your help.