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Red Crown Rot of Hop in Oregon Caused by Phomopsis tuberivora

D. H. Gent, G. Mueller-Warrant, J. L. Woods, M. L. Putnam, and M. C. Twomey

June 2013


During July 2007, symptoms including weak growth and death of plants of cultivar Fuggle were reported by a hop grower in Marion Co., OR. Phomopsis tuberivora H.T. Güssow & W.R. Foster 1932 was consistently recovered from affected plants. Koch’s postulates were fulfilled with three isolates of the fungus, establishing the pathogen and the disease red crown rot as the cause of the damage. This is the first report of red crown rot on hop in Oregon, which may have important management implications for affected hop yards and farms.


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