Concord grapevine appears to be dying
Last year, I planted 3 Concord grapevines. They all looked reasonably good until about a month ago. Suddenly, the one in the middle started shriveling up and losing all of its leaves. It hasn't grown any back, and may be dying/dead--I'm not completely sure. The other two vines still look fine, though.
If the other two vines continue to look fine, does that mean that what may have killed the third grapevine wasn't necessarily a disease, but perhaps something weather-related instead?