Table grape issues (forum)

Darren starts with ...
What is this? Can it be fixed?
Looks to be a bit of mildew present as well.
Thanks in advance!

Time: 19th March 2017 1:23pm

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About the Author Darren
Blackbutt nsw
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SueBee says...
No pic or link attached Darren?
Been a bad year for Botrytis rot and Mildew in grapes due to the rainy and humid weather.

Time: 29th March 2017 9:26am

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About the Author SueBee
SW Vic.
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Darren says...
Vines have been in about 4 or 5 years and they grow quickly enough bit then seem to get red splotches between veins. I have crimson seedless and concord. No flowers and no fruit. :(

Time: 1st February 2018 6:30pm

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Darren says...
Thank you SueBee. The red blotch on one plant and the withered new growth on the other. Could be wind damage .
Pictures - Click to enlarge

Picture: 1
Picture: 2

Time: 1st February 2018 6:52pm

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Darren says...
The growth is vigourous enough and main stem is 2cm thick bit I am getting closer to just ripping them up and putting in a passionfruit. I will try to get the spur pruning right this winter, but I am wondering if it will be worth it.
Pictures - Click to enlarge

Picture: 1

Time: 1st February 2018 6:55pm

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chookie2 says...
This may help.Hope I am wrong. https://doubleavineyards.com/news/2013/11/23/grapevine-red-blotch-disease/

This may be more help in ID https://doubleavineyards.com/news/category/disease-and-pest-management/

Time: 3rd February 2018 9:04am

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Fruitylicious1 says...
Hi Darren

According to viticulture experts there are a few reasons why grapes fail to produce flowers and fruits:

1. Sunlight - Proper sunlight is needed to initiate the development of flower clusters inside the buds. Lack of sunlight due to canopy or nearby building or structures which is the case in most built up suburban areas is always the issue. Selecting the planting site well before planting will greatly help production later on.

2. Improper pruning - different grape cultivars requires either of the two pruning technique (cane pruned and spur pruned). Some inexperience growers unwittingly prune the fruiting buds leading to less or no fruits at all.

3. Over fertilization - like any other flowering plants they don't feel the need to produce flowers and the subsequent fruit because there is an over abundance of food. Vigorous growth also compounds the problem of sunlight penetration due to abundant foliage.

4. Diseases - If the vine is constantly being attacked by diseases like powdery mildew, botryris and anthracnose the vine will abort flowers in order to survive. There are also mites that feed on the buds: rust mites feed on the outside of the bud and bud mites will decimate the inside of the bud.

If you are able to address all of those issues you might have a fighting chance to coax your vines to produce their goods. I think the hardest issue to resolve in your case is the adequate sunlight penetration especially if you are dealing with solid structures. Anyway, goodluck.

As Always....Happy Gardening :-)



Time: 3rd February 2018 4:10pm

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Original Post was last edited: 3rd February 2018 4:26pm

About the Author Fruitylicious1
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Darren says...
my vines have never been fed..I noticed that the young leaf clusters seem to be dying back as though windburned.brown tips and no vigour.The vines are north facing and get reasonable sunlight but the same red blotches happen every year.I cut them right back last year and sprayed with copper etc.It may just be time to replace with passionfruit, as if it is bacterial then I am fighting a losing battle.Bought at Masters..it would be horrid if they had sold diseased stock around the country.Thanks yet again!

Time: 5th February 2018 8:31pm

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Darren says...
Thanks chookie2 I stumbled upon that article last week and it looks very much like what my vines are doing. It would be horrible if that disease had a foothold here.Might be time to get rid of these vines.

Time: 5th February 2018 8:33pm

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