Which grape disease does my plant have

[Friso]

Hey there, my grapevine is suffering from a disease which i find hard to identify. The leaves get brown spots all over them, but there is no white residue eiher on top or underneath the leaves. Can anyone help me identify and possibly cure this?

 

[Pumpkinman]

That appears to be Black Rot Spots, as it progresses it will affect the fruit as well.
The following fungicides will help:

Mancozeb 75DF
Captan 50WP
Ziram 76DF
Abound 2.08F
Sovran 50WG
Pristine 38WG
Adament 50WG

The most critical period for controlling black rot with fungicides is just before bloom through 2 to 4 weeks after bloom.
I hope that this helps,
Tom

 

[Friso]

Hey Tom, many thanks for you quick reply! I'm heading to the store to buy one of the fungicides you suggested. My plant bloomed this week, so that ought to be just in time for the fungicides... Thanks again!

 

[grapeman]

Definitely it is black rot. Those are classic lesions on the leaves. You need to spray with such things as Tom says and spray every 7-14 days from pre-bloom to the time the grapes are about half size. You should have begun well before now. As you see the lesions already, the vines have already become infected so it is probably too late for this year.

 

[BMeloche]

Be sure to clean the vineyard floor very well. Anything that falls, leaves, stems or grapes, will contain fungus spores that will survive the winter only to spread again next year. I was in the habit of spot pruning during my morning walks and just tossing the damaged leaves on the ground and I'm paying for that this year.

 

[DaveL]

When it attacks the fruit do they turn brown then explode then shrivel up? I may have this.
Would this be avoided by proper training and pruning for better air flow? Also would the plethora of Rain we've had in VA contribute to this since it is a fungas?

 

[GEM]

Pruning and better airflow will help, but it is essential that you also have an ongoing spray routine for mildew. You also need to rotate the spray, as the mildew can become resistant if you only use one category of spray. It is a pain, but essential if you want to grow decent grapes almost anywhere, and especially when there is a lot of rain and or humidity.

 

[GrapeLover]

Hi,
I'm pretty sure my plant bloomed more then 4 weeks ago. will it be safe to consume the grapes from this tree if I spray it with one of above listed fungicides?
Thank you very very much in advance for your help!