What Fungicides are available?
The materials I have attached to this message describe all the fungicides that are options at this time of year, and my spray guide gives fungicide combinations I recommend for controlling both powdery and downy simultaneously. I think growers should be aware of and try using Phosphorous acid Fungicides for downy mildew control late in the season when Mancozeb can no longer be used. They are relatively inexpensive ( at least they were ) and they work. They can be used up to the day of harvest if necessary (0-day PHI) and I have not heard of any reports on negative effects on wine quality. These materials are good for downy, but do not control powdery so they need to mixed with a powdery mildew fungicide. See my spray guide for available options. For Organic grape growers, the only material I am aware of that will provide good ( reliable ) control of downy and powdery mildew simultaneously is a copper fungicide. Especially if it stays wet and you have a long fairly long time till harves
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