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.