Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu
Downy mildew on cucumbers is increasing in occurrence in commercial acreage but appears to not be reducing yields at the present time. Maintain sprays schedules on an appropriate interval. As we get later in the season it often means starting a spray program at the 1 to 3 leaf stage and keeping on a 7-day program initially. The forecast for July 29 was high risk for Delmarva, and depending where you were thundershowers would have brought rain and possibly spores as well. Keep cucumbers protected. New Jersey reported its first downy mildew occurrence on Thursday, July 29.