Ask a Question forum: Grape vine

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Meg
Jun 25, 2016 8:03 PM CST
I have notices my grapevine has some white powdery stuff on top of some of the leafs. Some of the branches have black spots on them as well. Is this due to the amount of ventilation and sun it's receiving or is it something else? What should I do?
Name: Daisy
Reno, Nv (Zone 6b)
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DaisyI
Jun 25, 2016 8:21 PM CST
Welcome!

First, you should send some photos so we can see what you are seeing. Second, you should let us know where this plant is growing.

Daisy
Name: Suzanne/Sue
Sebastopol, CA (Zone 9a)
Sunset Zone 15
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Calif_Sue
Jun 25, 2016 10:19 PM CST

Plants Admin

It's most likely powdery or downy mildew, the black spots are probably the damage caused by it. Yes, the lack of air circulation can comtribute to the problem.
Some photos and tips
http://www.agr.gc.ca/resources/prod/doc/sci/pub/pdf/id_guide...
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