Grapevine Blues

[uzboth]

I recently moved into a new house, complete with greenhouse and a grapevine.

I have read up and followed the best advice where pruning and caring for it wereever concerned. I did recieved warnings from the neighbours that the vine had some disease. They described how the grapes went "funny" and shriveled and they were covered in a white mould.

Everything has been fine up to about a week ago now, I went in the greenhouse and the leaves were looking real sick and the edges black.
Over the next day or so I treated the vine to a bicarb spray and this seemed to halt whatever was wrong. The leaves, when you look up through them into the light have brown spots all over them. Also the little bunches of grapes and the stalks that hold them all have tiny black dots on them. BTW I havent seen any evidence of any white mould on the leaves and they do stay dry all the time now.

Can anyone tell me whats wrong ? What can I do to fix this problem ?

The vine is over 30 years old, it is in a perfect position in full sun all day long inside a greenhouse, THe previous owner from all accounts grew this vine from a small seedling and only had problems over the past couple of years when the vine got too big to handle

Should I water the vine or not ?

HELP, CAN ANYONE SAVE GEORGES VINE ?

[OverWyreGrower]

The white mould and shrivelling is "shanking".

This often occurs when the grapes aren't thinned. It doesn't usually affect the leaves though.

Once the grapes start to develop, you need to thin them out (touching as little of the grapes/vines as possible). Use secateurs to cut the thinnings off (don't pull them).

If you start to notice the white mould later on in the season, cut the affected bunch of grapes off the vine (don't let them touch any other grapes etc)

Is the vine planted outside the greenhouse? If so, you shouldn't need to water it. Usually in the hottest weather, I damp down the greenhouse and give the leaves etc a good spray of water last thing as night.

Not sure re the leaf problem, sorry I can't be of more help!