My Canadice grape leaves are getting small brown spots, then the leaves turn more brown. Finally, they turn all brown except the veins which remain green. The grape production is not good. This vine is 8 feet from another vine, which is doing fine. Any ideas? If a picture will be helpful...I'll get to that. Please let me know.
I am by no means an expert but it sounds like "chlorosis". Maybe someone else will chime in with more. http://ohioline.osu.edu/hyg-fact/1000/1009.html