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Responding to an Introduced Pathogen: Podosphaera macularis (Hop Powdery Mildew) in the Pacific Northwest

W. F. Mahaffee, C. S. Thomas, W. W. Turechek, C. M. Ocamb, M. E. Nelson, A. Fox, and W. D. Gubler

November 2003


Powdery mildew of hop was found in the Yakima Valley, WA in 1996 and spread to the growing regions in Oregon and northern and southern Idaho. To rapidly assist growers, the Gubler/Thomas grape powdery mildew risk infection model was adapted for hops. Field surveys identified management practices that impacted disease development. Weather networks delivered daily maps on the web indicating the risk index. Lessons learned from this experience will be useful in addressing future pathogen introductions. Part of the proceedings of "Managing Risk to Minimize Crop Loss," a symposium organized by the Plant Disease Losses and Regulatory Committees of APS.


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