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Grape leaf disease

Posted by kudzu9 Zone 8b (My Page) on
Fri, Jun 7, 13 at 13:39

(This is a crosspost from the Garden Clinic in case I can't get an answer there.)

I live in the Pacific NW where we have rainy springs. I have 4 mature grape vines, all of different cultivars, and they grow together on a large grape arbor. I noticed that one of the vines - only one -- has a weird problem with the leaves. The leaves look normal on top and have normal color, except many of them have large raised bumps. When you turn these leaves over, there are spots of a whitish, velvety coating that does not rub off, and these spots correspond with where the bumps are. Below are photos of a typical leaf. I'd like to know what this is and what I should do about it. Thanks.

 photo Grapeleaf2_zpsf7799453.jpg

 photo Grapeleaf1_zps1af24a87.jpg

Follow-Up Postings:

RE: Grape leaf disease

  • Posted by fruitnut z7b-8a,4500ft SW TX (My Page) on
    Fri, Jun 7, 13 at 14:52

Check out the prior thread linked below.

Here is a link that might be useful: grape phylloxera management

RE: Grape leaf disease

It does look somewhat like phylloxera, but I have since had it identified by a local garden center as Grape erineum mite, which is a much more trivial problem than phylloxera (thankfully!).

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