Brown stalks on grape trusses and tiny grapes.

Sep 29, 2009 10 Replies

I think that we may have,but not quite,exhausted the discussions on mulching.Unfortunately I only have 30 vines in total and four varieties,so it will not be possible to do a control test.There is already some fairly large differences within the rows.I am inclined to continue mulching,but without added fertiliser,due to my very dry limestone soil I.I would very much like to hear what soil doubi...grows his grapes on.Is the mulch mainly there to give moisture control in a dry soil?



I have just picked most of my grapes with Brix between 17 and 19,which is quite good for English grown grapes in a cool climate.The harvest produced just above 2 litres of juice per vine,which again is quite good for me.As usual I have difficulty in knowing when to pick the grapes,it always being a balance between sugar content and rot setting in-I tend to pick at a slightly lower Brix in order to avoid the sorting out of the rotten grapes.



A couple more questions.


1)I noticed a large number of bunches had a brown section on the grape struss stalk,about 1/2"-3/4" long just at the point the truss is attached to the vine.Is this an indication of ripeness or something else?
2)On one variety (a German hybrid called Regent),several of the bunches had tiny grapes amongst the normal sized ones.These were normally ripe juicy grapes,but 1/8"diameter rather than 1/2".This obviously reduces the yield,and I wonder why these grapes did not grow to full size.

Hope you can help Regards,Michael


Michael,

Do you spray for fungus during the year?

Michael,

From what I've seen on the web, Regent is fungus resistant not fungus proof.

Hi doubi... Yes,I always spray all of my vines each two weeks during the season,mainly with wettable sulphur to suppress powdery mildew.I start before flowering and continue until just after veraison.I must admit that I am more careful with thorough spaying of the total vine with my other more susceptible varieties (Bacchus and Schonburger),but I do spray Regent every two weeks.Regent is a very easy vine to spray,as it has a less vigorous and more open canopy. Michael

It (shot berries) could be a sign of poor fruit set which could be caused by numerous things such as cool wet weather during bloom and fruit set or a nutrient deficiency such as phosphorus. Perhaps some organic source of phosphorous might help.

You have called my small berries 'shot berries'.I thought that these were a poor fruit set,but they are generally small hard undeveloped berries.The small berries I mention were perfectly soft ripe grapes,which had the same refractometer reading as the larger ones . Michael

I have looked at many pictures of phomopsis cane on the web,and my problem is certainly not that.There is no other evidence of anything wrong with the vine(it looks healthy),apart from these 1/2"-3/4" brown stalks just at the point where the grape truss joins the vine stem.There are a few other trusses which have died and become shrivelled without fully developed grapes. Michael

If you have a digital camera, perhaps you could take pictures and post them on the net and direct us to the page they are on.

Michael,

I think Paul is right. It probably was a fruit set issue. If the leaves of the vine look healthy then they vines are healthy. I would be surprised if it was a nitrient issue. If you can, mulch the vines more before the winter.

Sorry,Paul.I have already harvested all of my grapes.Despite my comments on a few problems,this has been a very good harvest for me,with the average Brix of all of my vines being 17.5.That is good for England,and when chapilatised(?)should make very good wine. Thanks for all of your help. Michael P.S.If I mulch at all next year,which I probably will due to my very dry site,it will be in February or March.

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