Downy mildew is one of the most important diseases of cucurbits and can cause significant yield losses. In the United States, the disease is common in the southeastern and eastern states. Topics addressed in this presentation include characteristics of the pathogen; symptoms and signs of disease; and disease detection, identification, and management. Resources for identification and management include the cucurbit downy mildew ipmPIPE website. This webcast is one of two offered as part of the USDA-funded project Regional Approach to Cucurbit Downy Mildew Prevention, Monitoring, and Management. The second webcast discusses management of cucurbit downy mildew in both conventional and organic cucurbit production.