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What to do about grape diseases #880218

Asked August 05, 2024, 9:35 AM EDT

Good morning,

The grapes on my vine are being afflicted with one (or more) problems. I am attaching a photo. Please note that these are red grapes when mature. Can you diagnose the problem(s) and suggest a remedy?

Montgomery County Maryland

Expert Response

The symptoms pictured look like Black Rot, a very common fungal disease to which grapes can be very susceptible (there are no resistant cultivars). The linked page provides more information, but essentially, there is no treatment which will cure existing infection. Preventative fungicide sprays can be used next year, starting in early spring and continuing as long as the product you choose to use instructs (several repeated treatments will be needed every year). Remove all symptomatic, infected debris in the meantime (both now and this winter) so it doesn't harbor infectious spores for future outbreaks.

Miri
Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied August 05, 2024, 12:30 PM EDT
Thanks so much for the very quick response. I’ll try to be ready for next year.



On Monday, August 5, 2024, 12:30 PM, Ask Extension <<personal data hidden>> wrote:

The Question Asker Replied August 05, 2024, 12:38 PM EDT
You're welcome.
Answered by the Home and Garden Information Center (HGIC), University of Maryland Extension. For timely gardening information and tips, subscribe to our Maryland Grows blog and quarterly newsletter. Follow us on Facebook, Instagram, and YouTube. Replied August 05, 2024, 3:47 PM EDT

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