Pseudoperonospora humuli

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Pseudoperonospora humuli - foliar lesions on the underside of a hop leaf
Authors: GLilian B. Calderwood, Scott A. Lewins and Heather M. Darby
Source: Journal of Integrated Pest Management (2015) 6 (1 - 18), p. 5

Pseudoperonospora humuli (Miyabe & Takah.) G.W. Wilson - (hop downy mildew)

The oomycete infects hop in Europe and the Americas, causing significant yield losses if not controlled. The disease spreads mostly via zoospores in wind and rain splashes. These enter the leaves through stomata. Durable oospores are also formed.

Symptoms include pale green-yellow shoots with short internodes, chlorosis and stunting. Foliar lesions are mainly angled brown spots on the underside of the leaves. Management usually involves a combination of resistant cultivars, hop yard sanitation, and fungicides. However, there are no hop cultivars with 100% resistance.

Vernacular names
• Deutsch: falscher Mehltau des Hopfen
• English: hop downy mildew
• Español: mildiú del lúpulo
• Français: mildiou du houblon

For a review see Purayannur et al. (2021).