Delayed growth of grape plant

Question

My grape plant is 6-7 years old. The problem is that every time grapes start to grow on it, instead of becoming ripe, they become black. Is there any reason for this happening and how can I fix it?

Thanks,

Answer 1

This is Black Rot.
Here is a link with more information.

https://en.wikipedia.org/wiki/Black_rot_(grape_disease)