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A Decade of Hop Powdery Mildew in the Pacific Northwest

D. H. Gent, M. E. Nelson, A. E. George, G. G. Grove, W. F. Mahaffee, C. M. Ocamb, J. D. Barbour, A. Peetz, and W. W. Turechek

March 2008


Hop powdery mildew, caused by the fungus Podosphaera macularis, was confirmed in hop yards in the US Pacific Northwest in 1997. The US hop industry experienced significant crop loss and damage from the disease, but new knowledge, grower experience, and management approaches have allowed the industry to survive the introduction of this pathogen. This review provides an overview of research on and progress towards economically sustainable management of hop powdery mildew in the US, and future directions for research and further innovation.


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