Black rot on new grape vines

Asked June 22, 2017, 10:48 AM EDT

We ordered six grape vines from TyTy in Georgia. All are rated for our zone. Got them a couple months ago and planted then. They took off beautifully and leafed out, even producing grapes. But last week they seem to have developed black rot and all the grapes are gone, and the leaves are turning black at the edges. Could you make sure it's black rot from the photos and let me know if there's anything I can do to save them? Thanks!

Calvert County Maryland grapes black rot possible fertilizer burn

1 Response

We viewed your photos. We notice black rot, a fungal disease on the grapes and it is too late to spray this year. Practice good sanitation. You can minimize problems by removing infected fruit, cleaning up mummies, and pruning out leaves that surround fruit clusters.
See our website for more information and the Va Tech Spray Schedule
http://extension.umd.edu/growit/fruit-profiles/grape

We are not sure of the cause of the black edges on the grape foliage. A possibility may be fertilizer burn, excessive salts taken up by the roots.

Monitor your plants and submit photos if you notice additional symptoms.
mh