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ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research » Research » Publications at this Location » Publication #336990

Research Project: Reducing the Impact of Diseases on Hop Production

Location: Forage Seed and Cereal Research

Title: Evaluation of fungicides for hop downy mildew, Hubbard, Oregon, 2016

Author
item Gent, David - Dave

Submitted to: Plant Disease Management Reports
Publication Type: Other
Publication Acceptance Date: 1/20/2017
Publication Date: 3/7/2017
Citation: Gent, D.H. 2017. Evaluation of fungicides for hop downy mildew, Hubbard, Oregon, 2016. Plant Disease Management Reports. 11:V048.

Interpretive Summary: Downy mildew is an important disease of hop. This research was conducted to quantify the degree of control of the disease with an industry-standard fungicide that belongs to a mode of action group that is known to possess some level of resistance and identify possible alternatives. No suppression of the disease was observed with the industry standard fungicide, indicating high levels of resistance, whereas a fungicide with a different mode of action yielded satisfactory control.

Technical Abstract: This research was conducted to quantify the degree of control of the disease with a phosphorous acid-based fungicide, the present industry-standard for management of downy mildew on hop in the Pacific Northwestern U.S. No suppression of the disease was observed with the industry standard fungicide, indicating high levels of resistance, whereas a fungicide with a different mode of action yielded satisfactory control.