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ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research Unit » Research » Publications at this Location » Publication #380898

Research Project: Breeding, Genomics, and Integrated Pest Management to Enhance Sustainability of U.S. Hop Production and Competitiveness in Global Markets

Location: Forage Seed and Cereal Research Unit

Title: Evaluation of fungicides for hop powdery mildew, study 2, Granger, Washington, 2020

item MASSIE, STEPHEN - Washington Hop Commission
item CLAASSEN, BRIANA - Oregon State University
item Gent, David - Dave

Submitted to: Plant Disease Management Reports
Publication Type: Other
Publication Acceptance Date: 1/16/2021
Publication Date: 4/3/2021
Citation: Massie, S.T., Claassen, B.J., Gent, D.H. 2021. Evaluation of fungicides for hop powdery mildew, study 2, Granger, Washington, 2020. Plant Disease Management Reports. 15:V074.

Interpretive Summary: Hop growers face a difficult challenge in managing the disease powdery mildew because most cultivars grown in the U.S. are susceptible to the disease at some level, and thus require a combination of cultural and chemical control measures to manage the disease successfully. However, certain crop protection compounds used presently may be unavailable in the future because of changes in how pesticide residues are regulated in other countries. In this report, we summarize research to identify reduced-risk fungicides and biological control agents that are effective and mitigate potential barriers to trade in international markets.

Technical Abstract: Powdery mildew remains a serious threat to hop production because of the lack of widely available resistant cultivars and the difficulty of managing the disease with only cultural and chemical control measures. Regulatory changes further threaten disease management efforts because crop protection tools approved in the U.S. may have import tolerances revoked in major export markets. This report summarizes efforts to identify reduced-risk crop protection tools that will enable U.S. producers to maintain adequate disease control and mitigate trade barriers in key export markets.