Downy Mildew on Roses and Fungicide Treatments

Downy mildew on roses in Florida production areas is not uncommon.  This disease causes leaf spots which can cause significant defoliation.  The disease best grows with cool to warm weather (60-70 F) with high humidity and leaf wetness.   Here is a link to a good article on rose downy mildew from e-Grow with recommendations for preventative fungicide treatments.     https://e-gro.org/pdf/2017_719.pdf