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  • From: "Lon J. Rombough" <>
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  • Subject: Re: [nafex] powdery mildew on grapes
  • Date: Wed, 31 May 2000 09:59:58 -0700

The classic treatment is sulfur, though more as a preventative. Once the
disease has started you have to use wettable sulfur and spray it on. I've
also been looking into a new product called OxiDate that looks interesting.
It's a peroxide compound that releases oxygen when sprayed on and will kill
established mildew. I have a paper on it, but it's pretty long to post.
-Lon Rombough
Grapes, unusual fruits, writing, more, at

>Subject: [nafex] powdery mildew on grapes
>Date: Wed, May 31, 2000, 7:04 AM

>Hi all, while we're on grapes French Columbard vine has developed
>severe case of powdery mildew...all of my American varieties are untouched
>(obviously, I guess), as are my other viniferas...only the Columbard (fruit
>included, it seems) has it. Does anyone have any spray suggestions for me
>that might check the pm? I'd be grateful. Thanks so much, Patricia Rishel
>Los Angeles USDA Zone 11
>Hot off the press- summer's here!
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