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Hop Downy Mildew Caused by Pseudoperonospora humuli: A Diagnostic Guide

S. Purayannur, T. D. Miles, D. H. Gent, S. Pigg, and L. M. Quesada-Ocampo

May 2020

Diagnostic Guide

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.


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