Skip to main content
ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research Unit » Research » Publications at this Location » Publication #371011

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: Hop downy mildew caused by Pseudoperonospora humuli: A diagnostic guide

item PURAYANNUR, S - North Carolina State University
item MILES, T - Michigan State University
item Gent, David - Dave
item PIGG, S - North Carolina State University
item QUESADA-OCAMPO, L - North Carolina State University

Submitted to: Plant Health Progress
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/11/2020
Publication Date: 5/19/2020
Citation: Purayannur, S., Miles, T.D., Gent, D.H., Pigg, S., Quesada-Ocampo, L.M. 2020. Hop downy mildew caused by Pseudoperonospora humuli: A diagnostic guide. Plant Health Progress. 21(3):173-179.

Interpretive Summary: Correct diagnosis is essential for correct treatment of disease. This publication is a diagnostic guide for the disease hop downy mildew, one of the most serious diseases affecting hop. We review basic biological information on disease diagnostics and research methods central to correctly identifying downy mildew and working with the causal organism. This information will aid practitioners and researchers in making a correct diagnosis and also provide useful information to accelerate research on downy mildew.

Technical Abstract: Downy mildew, caused by Pseudoperonospora humuli, is one of the most destructive diseases of hop. The purpose of this article is to provide an overview of the pathogen, the host range and geographical distribution, and the means to diagnose the disease. It is important to be able to diagnose downy mildew and distinguish it from other diseases for the timely application of suitable management practices. The procedures for laboratory propagation and maintenance of isolates are also presented.