My 5 year old King of the North grapes are looking sick. The leaves are starting to turn from deep green, to light green, to yellow and then brown and curled. This happened on a few plants last year and they didn't really produce any fruit. A few had some winter kill this spring too. What is it and how can I treat it?
Hennepin County Minnesota
We don't have enough information to diagnose the problem. If you submit your question again accompanied by sharp photos of the affected leaves/vines, we might be able to help.
As an alternative you might address your question to members of the Minnesota Grape Growers Association via their Google group forum.