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Q.

verticillium wilt in a tree and high phosphorus fertilizer

Zone Richland WA | Loren C Schmid added on October 20, 2017 | Answered

What content ratio is best to use to help the tree resist the disease?

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BushDoctor
Certified GKH Gardening Expert
Answered on October 20, 2017

I would say that a better way to manage the disease, and prevent problems would be to use wettable sulfur. That and a little dolomitic lime to regulate pH. Phosphorus will raise the soil pH, but it will not, necessarily, kill any diseases on its own.

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