Marquette nutrient deficiency?t

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havlikn

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I have found this discoloration on my Marquette leaves, have not noticed any issues on other vines in the area. Only thing I can find in my research is potential potassium deficiency. Any thoughts? ImageUploadedByWine Making1500902501.463463.jpg ImageUploadedByWine Making1500902516.336093.jpg ImageUploadedByWine Making1500902525.535901.jpg
 

havlikn

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Interesting article. I am located in se wisconsin. I will have to dive more into the article.
 
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