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ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research Unit » Research » Publications at this Location » Publication #430173
Research Project: Development of Superior Hops and Resilient Hop Production Systems

Location: Forage Seed and Cereal Research Unit

Title: Evaluation of fungicides for hop powdery mildew, study 1, Granger, Washington, 2025

Author
item MASSIE, STEPHEN - Washington Hop Commission
item RICHARDSON, BRIANA - Oregon State University
item Gent, David

Submitted to: Plant Health Progress
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/13/2026
Publication Date: 5/11/2026
Citation: Massie, S.T., Richardson, B.J., Gent, D.H. 2026. Evaluation of fungicides for hop powdery mildew, study 1, Granger, Washington, 2025. Plant Health Progress. 27(2):346. https://doi.org/10.1094/PHP-11-25-0263-PDMR.
DOI: https://doi.org/10.1094/PHP-11-25-0263-PDMR

Interpretive Summary: Powdery mildew in hop is one of the important diseases growers must manage in the U.S. This report presents data on how well different fungicides and fungicide alternatives control powdery mildew. The results will help hop growers improve their strategies for managing this disease and reduce unnecessary or wasteful inputs.

Technical Abstract: Powdery mildew of hop is caused by Podosphaera macularis. This disease affects all green tissue of the hop plant, forming white colonies of mycelia and conidia. Infection of the inflorescence, or cones, can lead to discoloration, shatter, and damage to crop yield and quality. This report communicates efficacy data of various fungicides against powdery mildew. This trial was conducted on the hop (Humulus lupulus) cultivar ‘Galena’ during the spring and summer of 2025, near Granger, Washington. Results from this trial will help producers develop more effective management approaches for the disease.