A friend dug up his vines having no luck because of disease what I discovered was a problem called Black Rot. A fruit that early on looks very nice begins to develop spots that eventually lead to the drying up of the berry and kills the harvest. The local ag center identified the problem for me and directed me to use an application of Captan a water soluable powder sprayed on at first sign of buds. The application must be applied every 10 days up to harvest.
I lost about half the fruit before discovering the solution and learned enough to get ahead of the problem so come spring Ill be ready.
The problem is that the spot is a fungus that winters in the root so it is always present as the new growth begins to develop the spores are transmitted to the leaves and then to the fruit by the wind and birds etc. When the infected berry dies it falls to the ground called a mummy and the disease continues to regenerate itself.
The Cantan forms a chemical shell about the new growth and the spores cannot infect the plant and protects the fruit. A lot of attention is required to keep the vine healthy. I know of no way except to pull the vines and not replant in the same location. The "Mummies" will infect a newly planted vine. I will see how this season goes and then decide what to do.
I will talk so some of the local wineries and see what they tell me.
I would ;ike to hear from anyone has battled this disease and how you managed it. Early on the fruit really looked promising. The spots first started to appear on the leaves and as the berry clusters began to appear it quickly took control. These vines are 3 years old. There are 3 different vines all I know is they were reds, whites and blues. 4 vines total.
In general the garden did pretty good this season but it did tell me it needs a little boost this winter so Im going to get some 30-30-30 tilled in in the next week or so as soon as the ground dries a little. Middle Tn has had a real cold snap as most of the country did but its a little more normal this week. Hope everyone made it through that miserable cold spell alright, hey spring is a day closer and before long its time to plant.
I do have a visitor to the garden who loves those grapes. I'll share as he does a good job on the bug patrol