Downy Mildew Plant Disease Management Report

Downy Mildew on hops.

Downy Mildew on Hops.
Downy Mildew on Hops. Photo Courtesy of Michigan State University Extension.

Downy mildew is caused by the fungal-like organism Pseudoperonospora humuli and is a significant disease of hop in Michigan, potentially causing substantial yield and quality losses. This disease affects cones, and foliage and can become systemic; in extreme cases, the crown may die.

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