Downy mildews caused by different water molds are thriving at this time and damaging crops. If you see cucumber or butternut squash leaves quickly turning into a yellow, angular shape from the top, you may suspect a downy mildew caused by one of these pathogens belonging to water molds.

Cucurbit Downy Mildew (CDM) caused by the water mold, also known as oomycetous organism Pseudoperonospora cubensis, is a devastating foliar disease of cucurbits which may wipeout crops in a short window span if humid and wet weather prevails for a long time. The disease was confirmed on cucumber plants that were grown on Sentinel plots located at Randolph Farm in Southern Chesterfield County, Virginia.