powdery mildew on grape leaves ?

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andrew_yek Neuss, Germany Aug 02, 2013

i just want 2 know if this is powdery mildew on my grape leaves ?

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drobarr Hummelstown, PA(Zone 6b) Aug 02, 2013

That is not powdery mildew or any fungal pathogen.

My guess is that it is a nutrient deficiency, most likely phosphorus. Could potentially be potassium.

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