grape vine care - Knowledgebase Question

thousand oaks, Ca
Question by mandpmccoy
April 16, 2009
I have a Thompson seedless grape vine with tons of new foliage but I am starting to notice a powdery light grey almost mildew looking substance on the leaves. A few leaves are starting to shrivel. What could it be and what can I do?


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Answer from NGA
April 16, 2009

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Thompson's Seedless is prone to powdery mildew. To help avoid the problem, provide as much direct sunshine as possible and as much air circulation as you can around your grapevines. If mildew attacks, control by spraying with water to wash spores off, or pick off infected leaves and destroy them. You can also control powdery mildew with sulfur sprays or neem oil.

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