Ask a Question forum: Grape vines

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Pittsburgh, PA
dawilliams69
Jul 27, 2017 6:06 PM CST
I have two catawba grape vines. They are about 5 years old. They have spread out a great deal and look very healthy. Every year I prune them in the recommended fashion. Each year they produce about 1,000-2,000 green grapes. My problem is, every year, the grapes go from green to rotten without ever ripening. Does anyone know what causes this and/or what can be done to prevent it? Thanks, Doug (Pittsburgh, PA)
Name: Karen
NM (Zone 7b)
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plantmanager
Jul 27, 2017 6:12 PM CST
Welcome to NGA! I can't help, but maybe this member will have an answer for you: @ediblelandscapingsc.
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Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Jul 27, 2017 6:17 PM CST
Summer Bunch Rot?
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Name: Daniel Erdy
Catawba SC (Zone 7b)
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ediblelandscapingsc
Jul 27, 2017 7:49 PM CST
Thanks Karen, my guess would be grape black rot because you said they go from green to rotten before ever ripening. Summer Bunch Rot will only appear when sugars are above 8% and the grapes start ripening. The timing is right for black rot to start showing up, it likes it hot and humid. Frequent rains and temperatures in the high 80s are perfect for black rot infection. Black rot affects all parts of the plant, but the most damaging effect is to the fruit. Most infections start when the fruit is half to almost full size. Early varieties with large grapes are the most susceptible. In general, grapes that ripen late in the season are affected the least.
Black rot spores love moisture, so you want to reduce the amount of moisture held in the canopy by providing great air circulation. During dormancy, prune heavily keeping only a few healthy, strong canes from last year's growth to allow better air to flow. Prune out any diseased parts of the vine and keep the vine tied up and off the ground. If all else fails there is also numerous fungicides you can use if you want to go that route. Good luck and please keep us updated.
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Pittsburgh, PA
dawilliams69
Jul 27, 2017 8:47 PM CST
Thank you Dan and all who replied. It may be too late for this year's crop but I'll give it a try. At least next year I'll know what I'm facing and I can take steps earlier in the season to prevent it. Thanks again!
Name: Karen
NM (Zone 7b)
Region: New Mexico Critters Allowed Region: Arizona Xeriscape Greenhouse Annuals
Cactus and Succulents Bromeliad Adeniums Orchids Tropicals Plumerias
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plantmanager
Jul 27, 2017 8:52 PM CST
I'm glad you got the problem identified. Thank you, Daniel! Good luck, I hope you can have a nice crop next year.
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