Anthony Keinath is professor of plant pathology at the Clemson Coastal Research & Education Center in Charleston. His expertise is in diseases of vegetables. Dr. Keinath is also a member of the CucCAP Integrated Disease Management Team. This article for gardeners is published in The Post and Courier, a Charleston S.C. newspaper. The article discusses downy mildew on several varieties of cucumber, other cucurbits, and other crops.
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Downy mildew on a cucumber leaf. Image from The Post and Courier and Anthony Keinath.